You just need a popular site. When there are masses of free link exchanges people really dont need to advertise on a site that doesnt contain anything specific.
I dont know if its just me but it seems like your trying to do too much with that site, what you should be doing is splitting it up into other smaller sites, which will generate more revenue in total.
The fitness thing should be one, the webdesign should be one, the game should be one, you could make the religion side into one... you have far too much on one site, narrow things down and look at your overall goal in perspective.
Sorry bout that, just got carried away