Sure if you like playing Video Games you can buy a Xbox 360 even if you already have a PS3 or Vice versa.
yes
The xbox 360 does allow split screen compatibility already.
Nothing wrong with having both a Xbox 360 and a PS3. You will not be the first person to purchase and keep both consoles.
yes you can. on everything i guess.
play with two people by playing split screen
You can have more you can have up to 4
There should be an option that says local, or x-box live, or something like that. You have to switch it to split-screen.
srry but you cant press start and exit to the main menu.
yes you could with another person playing on the same xbox 360
Go to multiplayer, then go to split screen.
No only on campaign is split screen
no split-screen