today I got my highest paying click so far $2.25! Woo Hoo! hopefully this is a good sign for the future. it was a real estate click http://thecanadarealestatenews.blogspot.com
Depends on the niche. It is not uncommon to get even more. If you have quality content then you will get quality ads.
High paying clicks are great, just do a little research. I've found a great research tool to be the television and the radio. The advertisements that you are always seeing and hearing, those are the ones that will probably have internet advertisers willing to pay good money for top position. Without giving too much away here are some high paying topics: mortgage, auto insurance, cancer, student loans, any finance/credit related. Good luck!