Re: Raped Justice
Course it does, it's a different ballgame, but I'd say a more stable one than relying on one person to keep up their motivation by themselves most the time anyways. I think both people need some skills in both things though so if anything ever happens, they know how to pick up the project, find new people, communicate with eachother, etc. Maybe it's just that I've seen a lot more "In-progress" free games like these be completed or continue on with frequent updates when it's a team working on it rather than just one person.
Two programmers seems silly

I'm talking like Artist/Programer. Of course it depends on what type of game they make and what programs they're using to accomplish it for how difficult it is for multiple people to be working on it. I'm thinking of like an RPG maker game as an example because it's the only thing I've used in the "programming" department (Not really programming, but close enough, a different job anyways) as well as making my own custom sprites and such for it. That wouldn't be difficult at all for Artist/Programer.
I think the most important part is that you'd have another person relying on you and spuring you on, yes they could quit, but there's always more people willing to help out. If one person in a two person team quits, there's still one left doing work and with the possibility of salvaging the project. If one person in a one person team quits, game is dead.
I think you need a pretty good relationship with whoever you're working with. Should be decent online buddies anyways.