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Pretty sure you can.

+1

Neither do I. Isn't it possible that he just bought a lot of games?
You should have taken a look at his steam profile before bringing up such accusations.

I bought in the past a lot of bundles or cheap games from winter and summer sales just because it was a reasonable deal and I think OP and many of us have done the same.Even now I don't know all the games from my library that have a multiplayer or not.

You only have 35 games, I bet when you have 100+ games you can't remember which games have multiplayer...

Don't go around making accusations based on pure speculation...

And to answer your question: Because he/she may have bought games purely for their single player, with no interest in whether or not they have multiplayer. I certainly do that, and I have little idea of which of my games have multi.

I currently have 720 games in my account and guess what, I have no idea which games do have multiplayer save for a few. I do mostly single player gaming so I don't care if a game is multiplayer or not when I purchase it. Plus I've got tons of bundle games that I never even looked at.

^This!

That's easy for you to say, but what about people with 500+ games?