Believe it or not I can't believe I'm doing it, either. I listen to Leo Laporte a lot on different podcasts and such and he kept talking about how amazing Bioshock is and lots of my friends really like it, too. So I bought it but my hardware is not up to spec. Yes, I could have got a $200 video card and got okay performance at a lower resolution but with this nice card I can play it at the best resolution I can support.
It will be around $365 after rebate. That is an amazing price considering the same base card is for $400-$500 by other manufacturers. It sold out a day after I bought it. I believe it's somewhat of a new card, too. The most I have ever spent on a video card prior to this is ~$160. Oh, and then I needed the $150 power supply...so add that to the cost. Plus the $50 game cost. Now I'm tempted to buy more of the latest games.
Unfortunately, the core problem with games is that they don't help me be more productive! I don't have enough time to do everything I need to do as it is...so I'll block out some more time for game playing.
Addition: can easily be thousands. Take the latest $500 processor and $500 video card...$250 power supply...more fans/better case/cooling $100. Nice mouse/keyboard $100. Oh, and then add a second video card (SLI) and second processor (dual-quad core processors). Oh, and add a physics calculation card (they're out there!) $200
I know someone who just spent $12,000 buying a new Mac. They get a new Mac every 3-5 years and spec it really nicely (30" cinema, obviously). Remember that this nice video card will help in other areas of system performance--especially if I had Vista. Lastly, add the extra power costs of 2 to 3+ times the power requirements for your system with all the extra hardware!