I read several blackhatworld buy sell sub forum. Almost all of them offer I will make 200, 500 , etc Backlinks within 24 hours. No one offer less than 30-50 Backlinks packages why is that? Yes its more attractive marketing, less than US $20, they offer huge Backlinks. But the problem is as far as i know Google punish this type of instant huge amount of backlinks, they like natural links. Personally I don't like to purchase huge backlinks packages (dude to Google blacklisting) .