If you have a geocaching or other outdoor related blog, I'm not going to tell you what to do or how to respond, but I am going to tell you to please be cautious in dealing with guy and this network of spam sites. From what I can tell, this guy sets up dozens of outdoor-related websites like the ones mentioned above, and then simply slaps advertising around other people's content to make money.
In addition, if you look at the "terms" associated with agreeing to "publish" your content with him, you'll see statements like these:
"You further agree to give us the royalty-free right to use, incorporate, exhibit, reproduce, distribute, promote, publicize, and otherwise exploit your Likeness in any and all media, now known and hereafter devised, throughout the world and in perpetuity in connection with your Contribution."
"The above licenses granted by you in Content you submit to the Service are perpetual and irrevocable."
This stuff is bad news, people. If you get contacted by them, please think twice before you get involved.