I bought a site on flippa (not telling the link or domain) that was making $1000-$1500/month for about $12k. However this was because 1 guy was buying leads from the site. Once I bought the site, the guy stopped buying leads. I'm making money from adsense but only about $30 /month, i've tried multiple CPA things but not very effective since this is a very very specific NICHE site. Lesson: If you are going to buy a site on flippa for a large amount of money, make sure it has more than one revenue stream because if that disappears then you are screwed.