I just put adpolar ad code into my site a couple days before, good ads are showing up, but very meager profit rate, as of now. Have a look -
Never heard of it but I'll check it out and report back. As long as it is USA based you usually have some protection.
Not really, most of the time no ads show up(default banner)..but when they do show up people tend to click them a lot, mainly coz the ads are interesting, related to making money online and stuff. And the CPC value is very good too.