You don't need one, no, but why not? Looks like it could be fun.
Seems like you're being awfully derogatory for no reason, while AGS has its fair share of crappy games made in five minutes, it has professional quality games, some commercial, built by teams. While I very much doubt this project is going to hit those heights, there's no reason why a pretty good game can''t be made - while offering those who don't possess the skills to create an entire game by themselves to contribute.