Started getting warnings about using too much data from GMail and the only way to solve it was to purchase one of their business plans. It wasn't that i got a lot of mail but I did have a lot of devices syncing. If i have to buy something I was going to get something with extra features I thought were useful and someone that can be talked to for support if necessary. That is why I signed up for MobileMe.
GMail did its job when it worked though.