If you bend a steel frame, you don't bend it back do you!
I'll just ignore your opening sentence for now. The point of my comment was that everyone thinks that aluminum frames are the greatest thing. Well we are seeing that aluminum frames don't reduce weight, unnecessarily increase the difficultly of maintenance, generally are believed to be too stiff for offroad riding, cause the price of motorcycles to increase, and can't be straightened or welded (that means buy a new frame when the bike gets tweaked in a get off). Lastly, it is certainly a revelation to me, as it will no doubt be to others, that the 2005 YZ450F was an ill-handling dinosaur that has finally been transformed into a winner with the incorporation of an aluminum frame into the design.
Yamaha went to the aluminum frame for handling. Looks like it worked!
The first gen Honda aluminum frames were stiff. CRF450X has a different frame than the R for off road. People here in Australia all race the R in enduro's, the X is crap.
Can you feel your bike flex? I know I cant. Guaranteed you won't be able to tell the difference in frames. The bike will just work better.
Motorcycles increace in price because of inflation. Might I add oil prices? China's boom has driven up the iron ore price so steel isn't cheap any more.
Don't cry when we get a better bike. We have to pay about $12,000 for a WR450F here in Australia, so don't winge to me about prices of bikes!