I've seen several similar comments. Do you know that Mobile Me's predecessor Mac.com was free for the first two or three years, then one year at half price, before raising to the current $99? So I doubt they'll drop it back to free as they have no problem getting $99 for it from most Mac users that I personally know.
A lot of Mac users don't have any problems shelling money out on any product with an Apple logo on it.
Fact is that today's Apple is a little different than yesterday's Apple. Once you start bringing in masses of people who buy a relatively affordable product like an iPod touch or even an iPhone, then you're bringing in a whole new customer base that Apple didn't use to attract before those devices came out. That is the significance of the market share Apple has been munching on since iPhone came out.
Apple has to be aware of this... and then again, they don't have to. People still spend the money anyway. It's just funny to me to see the faithful Apple fans feel neglected because Apple is trying to gain as much ground on market share. You see them complain because the Macs aren't getting updated, the MacBooks are not getting updated, the Mini's aren't getting updated... you get the drift.