It's legal and allowed. They're just trying to discourage the practice, though (with little success).
I did. Buying traffic is explicitly not allowed by Google. Anyone who is caught buying traffic, either from "1 million hits" or "1 thousand email/spam" or "traffic from disapproved sources" will get banned. The best thing to do is contact Google concerning the website you want to buy links from if it is OK. If the website came up to be a spam type system, you will get banned. Peace,
Ok so buying links is legal how about link exchanges like linkmetro and sites like that??? is that legal?
you can exchange,buy,rent,or lease links. google (as in adsense),has no say what you do to get links to your site.
Google was trying to do something about it a while ago but nothing happened because there is no way to stop millions of sites.