Good developers have never needed incentive to continue supporting their games. Take a look at the likes of Id, Epic, and Blizzard (pre-WoW). They all spent years and years after release fine-tuning gameplay mechanics and often times adding new ones through patches, putting out quality map packs, removing copy protection, and even publicly releasing the source code for the game engines themselves in some instances. Charging money for insignificant **** after the fact is purely an invention of recent console games, only dating back to the Xbox. Microsoft and Sony like it because they get a cut, plain and simple. They don't see anything as part of an audience that they are catering to, only mindless consumers that need marketed to. Sadly, most people seem to prove them correct.