http://dvice.com/archives/2011/06/capcom-tries-to.php
Capcom is trying out a new form of anti-used-sales assholery by making it so once you create a save file in Resident Evil Mercenaries, you can no longer start a new game from scratch. Ever.
As someone who is really into replay value, this makes me pretty upset.
Well...ok, no, it depends a little on the game. Like, this would be atrocious in a Touhou game. But there's also games that I play once, enjoy, and never have any real inclination to return to. Kinda like the difference between a movie I'd rent and a movie I'd buy. I would, however, expect that the price in a "rental" situation would be lower. Like, the price of that game had better be half that of a full-price DS game (so...$15? Yeah, I'd be okay with it if it was $15).