ive tried and tried to be compliant with my sites, i think when you use certain java or html banners theres no way you can, and for the poker industry we rely on html banners from these other sites which is what i think causes the sites to be un compliant. i know
full tilt used to give me problems with html errors and also stat counter, i dont have much experience with that sort of thing just giving a personal opinion, as far as the sales guys goes hes trying to get your business, i think it would be more helpful to have clean html code with minimal errors, i run sites through netmechanic and even the most well known sites have browser compatibilit problems as well as html errors! in jist i wouldnt worry about it, you seem to do fine with out some guy who claims he can produce for you!!!!