Another Option To Make Money Other Than Ads?

i have a friend who is running his site on a dedicated server, around $200 a month, and says he is making money off it, yet ive never seen a single ad on his site and he says he doesnt have any on there, all it is is a blog, no external links or anything, but hes making money somehow, is he pulling my chain or is there an actual way to make money off just plain traffic?

Original post by shekz