Hey, don't forget to check out the content of the site form which you want to buy a text link. It should be relevant to yours. Otherwise, it won't help with full capacity.

If the type of visitors it has are the same people looking for your content, it'll be ok. Otherwise, you may get traffic, but it won't make a high organic search engine ranking for you.

By the way, there are other methods which aren't so costly and you could have lots of control over the links yoou get. Besides, it could be one-way too.