Although digitalghost brings up an important point -- "I been getting lots of emails - suggests "spam mail" and not companies seriously having your interests at heart.
I could be wrong -- maybe aaronjf sites in question have a quality that many are just dying to getting into bed with you.
In my experience a trust relationship is earn over time. It's very hard to believe that someone would offer something in advance of knowing what they are actually going to receive in return. (If PR is the only motive, I personally don't believe a link is warranted).
On the other hand contact them directly "voice mail" and control the conversation. Find out why?