Why is there a bias against MP only games?

[Goatseye]

Jpcc86 said:

I feel "there's not enough content to justify a $60 tag" is argument enough.

If you like MP-only games that's fine, to each his own. Some of us consider multiplayer, specially in FPS games, something that should be a plus/bonus to a game, no the game itself. Again, to each his own.

Nowadays MP only games offer more to the customer than SP games. That's something I would probably agree to in the 7th gen.

Nowadays, more people buy games for MP than SP. For example, the amount of MP modes/content that Halo 5 is getting is extra ordinary. Devs/publishers of those MP heavy games make sure you keep playing their games for hundreds and hundreds of hours, by providing the game with a lot of support. Contrary to SP only games where post-launch support is very sparse and playthroughs consist of single session in few hours compared to MP only games.