I'm new to running adwords (though i've been serving adsense for a while now) I just received a high-price click from this site: http://www.stampedeband.com/ The site is obviosuly garbage made for adsense... Can i make it so my ad never appears on this site again?
Don't waste your time in this kind of research. Site exclusion is for competitiors site exclusion only and supports only 25 sites. How do you know that this click is an invalid one? There is nothing wrong with this site. Content network works due people searchs Google, go to sites like that and after it click on your ad due the site has almost no content. Use your time by researching Keywords and runing reports to check ROI - not by using "Site exclusion" in the way that it has not been designs for.