To SLI or not to SLI

Today again SLI is a big thing; however in 1998 when I bought my first PC we already had SLI brought out from 3dfx. Then as now SLI would have you by more cards and spend even more money on gfx. The beauty today however is the possibility to SLI on one card. Still the price is high and only for the hard-hardcore gamer, but why bother when Xbox 360, PS 3 boosts equal gfx for less money?? I would rather wait and maybe you can upgrade to SLI tomorrow when your current gfx card gets to old. Then again; maybe not.