If you haven't had problems yet then you might as well not worry about it. Compared to modern cards the GTS260 consumes to much power, and lacks DX11. If however you have a small monitor or don't play DX10/11 games (or still on XP) then none of this matters to you. Perhaps the $$$ is better spent on a new monitor or keyboard/mouse?
Looks like some one simply has some money burning a hole in their pocket. If your current PC does all you need it to do, why throw money away? Put it in the bank, save it for something later that you do need.
How much money? Can you afford to get another 21" 1680x1050 monitor? If you can you can then buy another GTX260 card assuming you have an SLI board and power supply, or a 5850 for some 3 screen gaming. (called Eyefinity for AMD or surround gaming for Nvidia.) If you don't know what I'm talking about, look up the terms on youtube. Your nearly there which is why I suggested.