Why are save games so big on the PS3?

[Alacrist]

lenardo said: how large a HDD you want? 250gig sata 3.0 run about 70 bucks at newegg.com for oem versions. 320gig is 80 400 gig is100 500gig is 135 750gig is 260

I don't wamt one I was just wondering thanks for the info!