Would this be considered ok -
1. Selling a link spot on my freesites to people. The outgoing link would be one of the three that I'm allowed (so, two links to my sponsor + one link to my link buyer).
2. Can I sell that spot per month, and change the link when I need do? if so, can I sell links on existing freesites, that have already been accepted and use one of the three outgoing links that I'm allowed to, for doing that?
I'm asking because I don't see any clear rule here. From what I've seen everywhere, it's ok to have a link back to "your hub" or your site, if it's within the 3 links count. I figure a link to another site (which will essentially be my sponsor too

as they will be paying for that link) should be ok, but I don't want to upset anyone. I want to do Freesites for the long run, so I figured I'd better ask first.