I think it's gotten to the point where companies like HT are keeping people in and forcing people out of the hobby. For example, I'm more interested in high-end, great looking highly detailed & finished licensed products than in mass-market stuff that's considerably cheaper; after all, anyone can make "okay" stuff - but truly great pieces are worth the wait. HT works for me.
But I can also see that the costs make it prohibitive for others. That's why, in addition to HT, Mattel is making Superman movie figures also. Twenty years ago, I'd have been thrilled to have the Mattel version on my shelf, but in 2011 it looks like a 1991 toy to me - I can't rationalize buying it. I'd rather have fewer, but better, figures. Your mileage may vary of course.
FWIW Mattel is also doing Back to the Future, I expect them to be similar to their other 12" figures (altho probably not as nice as their flawed, but still okay Ghostbuster figures). At least there will be something in a lower price range.
I don't know for sure, but i expect the DX designation may have more to do with licensing costs than anything else - sure the figures are decked out - they ought to be for that kind of money - but I would guess that license costs are higher, production costs are higher, and overall sales are probably down or flat due to the economy. Something has to give, so Star Wars pieces need to be $300 DXs. Thats said, the Luke looks like a great deal to me, alto there's considerable heartache & stress dropping $300 at once, you're getting two full figures and a dio piece. If you can afford it, buy two of the SS exclusive and part out one - I bet you get enough return to pay for the both!