Of course Google do not agree with buying links, but the only way they could find out if a links is paid or not in that scenario is that the blog owner would be advertising links for sale. HOWEVER if the article is well written (by you I assume), then it will be of use. If OTOH it is a crap article on a crap blog and the ONLY posts on the blog are paid posts, then again in time this IS likely to get picked up.
I have to ask you this question though. WHY would you pay, when there is every chance the dude would publish your article anyhow
