My point wasn't that the capacity has anything to do with performance. The capacity is generally something that users want considering the amount of data many people are storing on computers now. My point was mostly that you get more capacity for your money if you go with a hard drive, and most users do not need to pay a huge premium to get performance they'll rarely, if ever, really need. A standard 7200 RPM HDD will perform fine for most, and if the user really wants something faster he can get a 10,000 RPM drive instead. He'd still save a lot of money over an SSD with even half the capacity. (Newegg shows the cheapest 80 GB SSD at $249 while a 10,000 RPM 150 GB Velociraptor is $160.)
Also, for the record, that 80 GB SSD would, in fact, be too small for my game installations. My OS and programs are all on one drive, and there is currently more than 80 GB used. I use a secondary drive for storing all non-program-related files too, so I can't cut down any more without moving programs themselves to a secondary drive. So yes, if you're playing several games, 80 GB is way too small.