For example if valve announced HL3 right now, and said OK there's going to be 2 versions
1) HL3 Blue Box $50 - Using basic source engine it's built multi-platform and works on Xbox/PS3/PC, it comes with graphics approximately equal to HL2 and no real improvements in any technology, has match making as standard, P2P multiplayer system, and ALL the nasty shit that console ports come with as standard.
2) HL3 Green box $60 - PC exclusive, comes with new advanced source engine DX11 graphics, new technology like physics, AI, animation blended with ragdolls, 3D vision support, native multi monitor support, proper mouse control, proper FOV, tweaked difficulty settings, smarter and more demanding AI, in game benchmarking tool, proper server browser, advanced graphics options such shaders, larger draw distance, more physics objects, better shadow system, a plethora of AA/AF controls, modding tools etc etc.
Which would you buy?
Ahahahahaha.