The prices do drop........... Mario Kart & Super Mario Land are hanging tough price wise for now, sure.........
However, these are the prices i paid for the following games (all new)
Dead or Alive: Dimensions (15 pounds)
Resident Evil: The Mercenaries 3D (15)
Shinobi (12)
Ridge Racer 3D (10)
Sonic Generations (17)
I paid the full 35 for Resident Evil: Revelations (best game i have played this year BTW) but i have already seen it as low as 24 new.
DS games i bought new.......
Mario Kart (10)
New Super Mario Bros (10)
Then throw in the AMAZING DS back catalogue that you may not have played (in particular the 3 Castlevania games) and software prices are no longer an issue.
Mario Land & Mario Kart 7 will eventually drop in price........ just enjoy the other games out there until they do.