I can see that from M$ perspective:)
You get a game for free (but only first instalment) - would you like to see what`s next ? buy it :) (don't see any other option for Adventure games - what else could you buy ? )
For 3D game - ok.. new weapons and so on.. but for adventure games, don't know :)
Also, it would be great, if for some reason, you like part 1, 2, and on 3, you get bored, so you won't buy any other - a great money saver :) if you would like to buy the whole game, than it would be cheaper as to pay alone for the parts :) And.. if you got some parts and you would like to buy the whole game, than it would have some deal :) this will be perfect :)
The more I read the "console flamewars", the more i love my dreamcast :D
Proud owner of: Dreamcast, PSP, PSOne, PS2Slim, Xbox, Xbox360, Nintendo DSLite, GB color, GB Advanced, Nintendo Wii







