Totally agree about the traffic, you'll get some provided the pages in MySpace and the rest are popular.
That's a challenge with MySpace. Unless you spend a good bit of time developing friends there, there's no other advertising mechanism in place to draw people TO your page. On MySpace, it's your friend base that helps bring you eyeballs.
Wikipedia however, can be different. If you are lucky enough to be added to a page there, and it's a popular page in terms of visits, then you'll see traffic with absolutely no effort. You just have to hope what is printed about you is accurate.