SSDs are for enthusiasts like myself, now I know some folks, who spend thousands of dollars on aftermarket chrome motorcycle parts. Do they need those shiny parts, no they can just do without, but they buy them because they are enthusiasts.
If an individual just surfs the Internet, emails or does basic usage, there is absolutely no "performance" need for an SSD. In a similar vein, why do folks build platter RAID setups, same reason for SSD.
It is actually a cheap upgrade for ones aging system to run quicker, as opposed to buying a new motherboard, ram, CPU, PSU combos. My Intel X25-M 80GB SSD cost $212.00. I was on the proverbial fence for awhile and took the plunge two months ago. After months of usage, I can honestly form an opinion for my situation, after the wow factor has wore off.
I will never go back to platter boot drives again.
Anyway, they aren't really needed, but for an enthusiast they are definately worth serious consideration or a must have.