I'm posting here because you developers might have encountered this before. I'm developing a plugin that should create some decent interest in a certain vertical - it's simple but hasn't been done before for this niche. Concept: it uses another site's API (kind of like Yelp) and displays some content on a wordpress page. If users click on any of that content, it will take them to the Yelp like site. The Yelp like site has an affiliate program. Anyway, I was thinking of adding an affiliate link on that content page and allowing people to remove it for a small fee. Is this permissible? Is there a better way to make money on plugins where the ability to get people to pay for it from day one is difficult? Thanks in advance and sorry if this isn't the right place for this post.