And the big question, which I'm going to answer is: "If such forums(sites) are already profitable, why would the owner sell them?"
My answer: there are different reasons, I will mentions some of them:
- some owners make sites just because they want to sell them and to earn money at once (for example a certain website makes $10 per month, but if they sell it, they may earn $1000 and to reinvest the money in other websites and/or another business).
- some owners just don't want to deal with the certain website anymore (for example they're tired to deal with some members in the forum, I had such a bad experience and I sold a SMF forum ago).
- other reasons.