Nah, I'm not an artist.
Yeah, part of the reason PSP hacking is so cool is the plugins you can get to add new features to the system. Controllable save state in games, cheat plugins, MP3 playing, additional sorting of entries in the VSH menu, etc. This is partially why I'm hoping for a softmod for the 3DS with plugin support, since (outside of DS software) it might be capable of the same sort of stuff.
One legit reasons I've seen is "I don't want to carry all my game carts and swap them out". I don't have many DS games so this doesn't apply to me, but for people that have like 25 games it can become an issue to carry them around.