It's not worth that much. I've seen that before too because I wanted to valuate some of my sites but also wanted to sanity check it with other sites I'm on. On every kind of site that does that sort of thing Saidit is always absurdly high while sites like Poal are only a little high too be believable. Maybe it's just total number of links. But for a site with about 60 real active users it's hobbieware, just like everything I own, which means it really is worth ~$100. There's nothing wrong with that. It becomes more reasonable to consider that something you put a lot of time into isn't a wild success when you consider that people are enjoying what you made and that's why it was made. But sites like these aren't really worth anything.