AdBrite / Other Qs

I have a humour website (funny images) that’s a few weeks old, and gets around 10-20,000 genuine visitors a day (most of which are unique) due to various promotion strategies.
AdSense was giving next to nothing for these, maybe a few dollars a day.
I’ve started to use AdBrite and it seems to be taking a while to kick in – yesterday I recieved upwards of 300,000 impressions yet only ~$8; my questions are;

Does AdBrite usually take a while to get started in terms of CPM/CPC price?
Am I right in thinking $8 for 300k impressions is low?
Do you recommend any other networks for my type of site?

Note; my site has no adult content, and I do not want adult ads.

See original post by t.m