No, never. I don't really like PPC sites, because they're so hard to make money off of. I make pennies from Bidvertiser, so I want to get money for traffic, not clicks.
unless you have lots, and I'm talking 10,000+ views a day here, CPM is most often worthless because it mays far far less then clicks and the adverts are usually the ones most users hate - with sound, animation and expanding bits
you can make a lot from CPC sites if you make them fit into your design, position them correctly and take other steps
I guess I'm not going to make a dime any way I do ads. ~lol~ Most of the money I got from Bidvertiser was me clicking the ads while at a public location. There were two people who clicked on the ads.
4,000 pageviews per day isn't going to cut it, is it?
probably not, but you can easily make a lot from CPC. Why aren't you using Google adsense - it is far mor ebetter then bidvertiser or Yahoo Publisher ads which are similar.