Getting an ROI through your PPC campaigns

I like AdBrite.  I have never made much money with AdBrite, but it is really easy to use.  All you have to do is find the site (in their marketplace) you want to advertise on, click their link, select the duration and you're done.  Very user friendly.

I think AdBrite is great for building your brand and brand recognition, other than that I'm not too impressed.

I can't seem to make any money with AdBrite clicks.  I have paid between $.10 and $.20 for most of my AdBrite clicks and spent about $100 and had 0 conversions.

Normally I have 5-10% conversions for this particular affiliate.

With AdBrite I advertised one 3 unique sites with 3 different demographics.  All of them were advertising for some college education thing from AzoogleAds.  0 conversions.

Anyone have any experience with AdBrite?  Was it good or bad?  How much did you have to spend?