2-3 times more ? Thats 600 to 900 $$. I don't think many people buy top of the line vid cards esp. that high just to play a game. I don't no where you buy your vid cards but that seems pretty high. The TOP of the line vid card cost like $600 but you don't really need that. You can get a badass vid card for $200 that works great on almost all games that i know of...
http://www.pricewatch.com I have a POS GeForce MX 400 that plays most games pretty good and I know a Radeon 9600 XT 128mb can run the games im playing really good and it only costs $100 and thats basically all you need.