anytime you have a site that gets a lot of hits, you have the chance to make money. The problem with those sites is that when you sign up you get basic info like how to get a website and how to promote it that you could have got for free from a few google searches. The trick to making money on the web is having a webpage with content that visitors will be searching for (like free money or something) and good search engine placement. The only problem is that there are soo many sites out there that are supposed to make you money, the market is getting saturated with different copies of the same service. Come up with an idea for a site with stuff on it people will want to see and place a few google ads or something you'll make some money but I'd be surprised if it was enough maintain the site itself.