I'm looking in to putting a couple of ad banners on my site so I can get some kind of $$$ coming in. My site is far from huge because it has just recently been published.

I've applied at a couple of places and 1 denied my site, the others I haven't heard from yet. The question is: Is it really worth having these ad banners on my site since it's not a huge site? Is that why I was denied? What are some good ad banner companies that are geared towards smaller sites but still have a decent payout?