Yeah, the promo cards are generally a really tough sell anywhere, I was never able to unload the cards from a couple of the previous World Championship games for any amount of money. I think that the last Yu-Gi-Oh game to go OOP before getting cheap was 2008, so as long as you exercise patience long enough you should still probably get 2011 at your buy price.
The only danger is that with the DS dying, I think that print runs for games might be getting smaller. The few must-have DS games of 2011 like Okamiden, Monster Tale, DQVI, etc. are still around MSRP, but if you have previous World Championship games lying around unplayed you won't miss it much.