I think this applies to collecting action figures in general. The problem is that there are people out there who wants to low-ball anyone for anything to the point of taking advantage of a seller. As such, these individuals may get emotional if a seller would sell something that he or she had purchased for clearanced prices years before. It is unreasonable for them to get upset over since the item that was clearanced off may not naturally be accessible to them at the time.
I know how you feel. A decade ago, I went to another toy forum and if I had extras or something I didn't want, I would sell my items at cost even if I bought it on clearance. For example, a Face-off Captain America vs Red Skull Marvel Legends set for 16 dollars even though at the time they were going for 30 dollars or more. At the time, I would ask the buyer if they were going to keep the items for themselves since I didn't want re-sellers to flip the item as I was selling my figures at cost, knowing how much they are truly worth; I wanted to help fellow collectors out.
I adapted this gentlmen's agreement from He-man.org where the forum owner convinced Mattel to produce 200 additional Keldor figures for the forum members. He only asked for the people receiving the figures from him for 20 dollars a pop not to flip them resell them on ebay as they were going for 90 dollars at the time; I was so inspired of what he did because of how difficult it was 16 years ago to get a hold of SDCC items w/o going to SDCC.
Even back then, I had no way of know to know if the buyer was telling the truth as the transactions were all through private messaging and most of the people who would pm me were lurkers who had just made an account just to make a purchase; I eventually adopted a minimal posting requirement. Eventually, one of the online forum members fromt he forum's chatroom said that I can't really tell the buyer that he can't re-sell the item right away since it would be his or her. That person was right. At the time I was going to sell him my Street Fighter SOTA Ken figure for 5 dollars (it went for at least 40 dollars loose). The transaction fell through as no money was exchanged and no one spoke of it further); this was an extra Ken I got from SOTA as both halves of the crotch pieces separated; it was not broken per se as the pegs that held them together were not broken off; the glue from the factory that held the pieces together wasn't strong enough.
When I went to the chatroom in the forums later on, the buyer kept saying random cuss words. I didn't realize why until later on that he must have been upset and the cuss words were towards me because that I didn't sell him the Ken figure. This was the last I seen of him. I previously sold him a Resaurus Tyrant loose for five dollars, which the going rate was 30 loose; it is currently going for 20 dollars on ebay. This realization had me realize that I should stop selling figures at cost especially since the figures I would sell were no longer sold at retails for years and were of demand. I initially sold them at cost since I was afraid of being labelled a "scalper". However, I soon realized that it is perfectly fine to sell the items for the going rate (though I tend to go a few dollars cheaper; I now use ebay to sell) since I had such figures in my posession for years and when I had them, I didn't plan to re-sell them.
On a somewhat unrelated note, I remember buying a Marvel Legends Tygra at cost from another individual at the same forum via; even though at the time, the figure wasn't discontinued, it was hard-to-find; I needed her in my collection as I never seen her at retail. Another forum member tried to buy the same item weeks after I bought it - the seller forgot to change the status of the item and informed the person interested in buying it that he sold it. The person who wanted to buy the item then made a comment on his buy/sell trade something to the likes of "Thanks for nothing. If you don't have the item, don't list it." I felt guilty since I bought the item weeks before.
I also know how you were mistreated by other users on the Cy Girl orientated group you speak of (as I was a member there as well). I remember it quite well since I was new to the forum, and I also frequented the chatroom there aswell. At the time, I was young and naive (I don't think I was in my twenties at the time), so I didn't know any better and most people gossip about you on the chat saying that you had a ton of rare Cy Girl figures unwilling to share. The funny thing is that I was new to collecting Cy Girl figures, which was very late into the line - it was when Electra was released, and the ones I had gotten on my own were not hard. I ended up getting Ray, Ice (game exclusive), etc. at normal online prices such as hlj.com ncsx.com so I wasn't jealous. The point of all this is that I was a dick to you (I posted a satricial poem about you on the forum, which you were aware of) because of what others said about you at the time. I apologize for it. Eventually, when I came to the boards here years later, I came to the realization that the majority of the individuals on that forum were jealous of you and a lot of the hate wasn't warranted. For those who weren't aware, people who were jealous of Delta where his age group and up. That said, thinking that was the younger generation that were jealous of Delta is incorrect.