I like "free" as much as the next guy. Personally, I don't think that we should have to pay to F'ing breathe, yet that seems to be the case these days.
The other side of the coin is, there are those who abuse the system, which requires moderation or oversight by those running whatever platform you're trying to use, which means expense on the part of the ownership of that platform. When I bought my 'Burb earlier this year a solid 25% of the posts were from scammers or [censored] dealers posting in the "owner" section of Craigslist. I'm now looking for a cargo trailer and it's the same deal, either scammers or [censored] dealers infesting the "owner" section.
Unfortunately, many of these sites, such as Craigslist, only have a "report post" or "flag" button, they don't allow you to state why the post is being reported. In the case of BITOG, and I'm sure I'll pay for this comment, the moderators are more concerned about language and sidestepping the language filters, than patrolling the trolls and troublemakers of the site. Being a moderator on a number of sites myself, I don't personally get it, but I don't have 10,000 posts here, so maybe I haven't earned the right to criticize?