For some reason you deleted your reply where you said that the content wasn't scraped or spun, in which case I would say you might as well try it because you don't really have anything to lose. I think it's safe to assume the content on those sites is informational in nature (ie. not related to buying things) so the only monetization method you really have for them is Adsense. And even if it only earns you like 50 cents per month or something, it's better than nothing. It's really just up to you to determine whether or not you think the sites are of high enough quality that you wouldn't be risking an Adsense ban.
You could also consider selling posts on them to other people, to at least cover reg fees and hosting costs.