Sgt_Kickaxe - 6:45 pm on Apr 8, 2013 (gmt 0)
I agree incrediBILL, it only takes a few good links, especially if your internal link structure is flat or built in such a way that spreads rank to internal pages efficiently.
Even if you pick up a horrible rotten festering link of doom it will take weeks before negative effects take hold and in that time any link will help, paid or not, so long as the page giving the link isn't already banned. I don't recommend link buying, and don't buy links myself, but link buying isn't as evil as Google would have you believe. There are good reasons for reaching out and offering compensation for a mention, just stay out of the common places people go to get links and do the legwork yourself where it makes sense.