So obviously you are not supposed to click on your own ads. I have had an Adsense account for several years and only clicked a couple of times by mistake, and even reported my mistake once.
What I find interesting now is there are ads optimized for me on my own sites. For example, I visited a dedicated server company site the other day, and now I have lots of ads from that company showing up on my dance related site.
It seems like if google has the technology to show ads optimized for me, they would have the technology to know that I am logged into my google account and have no problem with me clicking on ads on my own sites if it my lead me to buy something from the vendor, and further they would let me know I am not getting paid for ads on my own sites that are attached to my google account.