I'm just wondering, but how does one force 13,000 people around the world to visit a site you're telling them to? If anything it sounds like that many people have a virus infected and people take advantage of them and use it to throw them around the Internet because it's very hard to get 13,000 TRUE people to visit a site in one go.
These kinds of things have a very high chance of being scams.
And even when you get those visitors, to say your forum for example, they'll all be guests and be gone in a couple minutes if they even stay that long. After these 4 days, you've just wasted $40....