so the question is when is buying a text link BAD ..
If I buy from Google (Adwords) or Yahoo (YSM) that’s ok. my site will not pick up any penalties .. but what if I buy from Adbrite or Text Link Ads … is that ok ??
Now I have seen site fall from Google just because they where buying links, SO if Google sell s links and they ban you if you buy links (not from them of course) isn’t that a Major conflict of interest, I mean I can go to a site running adsense and click on the advertise here link .. But I can’t email the guy and say I will give $500 for a link ?? isn’t that Anti-Competitive and surely there are laws about it
Ok from http://www.google.com/webmasters/2.html
If we haven't picked up your site after several months, it's possible that our spiders aren't able to find your pages. If you increase the links pointing to these pages, it'll improve the chance that we'll find your site.
Sorry Matt : http://www.mattcutts.com/blog/text-link-follow-up/
Google’s stance on selling links is pretty clear and we’re pretty accurate at spotting them, both algorithmically and manually. Sites that sell links can lose their trust in search engines.