personally i dont see the point in making a single player game if MP is available.
Single player and multiplayer games are
completely different animals, the same game idea will rarely work well in both instances.
Some people like the competition or co-operation of playing against or with other people, others prefer games where they can dictate the pace, take thier time unravelling the plot & puzzles set by the author.
Personally I've always played table top wargames and they are obviously directly competitive, with up to 20 people playing at once, usually in two teams with a computer is used purely as a convenience in interpreting the hellishly complex rules!. I prefer
computer games that are single player immersive stories - "classic I.F." if you will, each to his or her own preferences I guess.
Must say that one of the reasons I'm drifting away from Quest now is that the Quest user base is becoming almost exclusively focussed on multi player games and as I don't enjoy playing them, I'm unlikely to want to write them!
Al (a.k.a. MaDbRiT)