Man, you've got some real nice tips, but i'd say, out of all of these, i guess the main one used is IP tracking, the others which include using google's other services dont matter much, from what i know!
Speaking specifically for a forum, one main and critical suggestion from me would be to never ever let the visitor see that dreaded 0 posts and 0 threads thing! It can really drive them off the minute they come in!!
You could either work on building content that is focused around high quality and high paying keywords. And if not, then you could focus on getting a higher CTR, this would give you a better chance at earning more!
Am really in for it man, you've got one unique idea. But then, you need to have a lot of girlfriends in the first place, if you want to promote it, obviously, you aint promoting it to the guys are you? hehe..!