You pay for the site to use the site, the site was in operational use. If they sold you greasemonkey and/or charged you for the add on script then you would have a legitimate gripe, but they do not charge you for the script nor for usage of grease monkey. It's not a product they produce and although ...
DiM: with all due respect, if you don't like the randomness of cards, just play no card style games, they have that option, sometimes its great other times it's not so fun, but they already have a solution to that dilemma in place.