Interesting concept though I wouldn't think anyone really thinks they're going to make money from a java applet.
I think (given enough people run that thing) the person that makes money is the one that hosts the site. He takes a fee of 19%.
Also I'm not one to trust easily in java script on a site that I just heard of.
If you think you must test better test it on a machine that is not hosting your wallet. Yeah I know that sounds paranoid.
Anyways thanks for sharing. The concept is indeed interesting, for using on your own sites if you have a lot of visitors.