I paid about $500 for a link there... the result? Pretty much fuck all lol... as others suggested you are much better off building a small network, that will be far more worthwhile. Not to mention this particular dumb fuck author put in 2 other links to make it look "natural", but even I could have written a better, more engaging article with just my own website as a reference. I am looking into setting up a persona and trying to get into contributor/editorials on high profile sites for this reason.
I suppose one of the good things is that this probably does pass down a good amount of trust to your website, it's good to have them in your overall link profile if it's a long term money site project. But if you're doing it purely for SEO purposes on a site you expect to lose, then its just not worth the cost.