Probably already mentioned, but here goes:
After reading Sweetmiffys post about a particular ad on her profile, I thought I'd float this out there.
WGT Premium Membership.
Buy a membership to play WGT as a premium member for a specified length of time. Membership would be paid by "real" money, not WGT earned credits. As a premium, members would be afforded an ad-free playing experience and some other goodies like maybe pro shop discounts, more avatar options, customizable(and ad free) profile pages, more replay space, etc, etc.
This is something that WGT should look hard at doing. I think most serious members would pay extra for this, and WGT would still have more than enough ad revenue from the free users. People are put off when they're still being bombarded with ads after paying sometimes hundreds of dollars of their hard earned cash to play this "free" game.
Please no responses about ad-blocks and browser extensions. That misses the point entirely and most users aren't exactly computing experts.