i host my own server too (at home) but I get to travel around and put my internet subscription on hold every time i go away for a few months. being able to quickly access your e-mail from any place around the globe, not worrying about your server going down while you're away, or not having to pay rent + utilities + internet connection = saving yourself time and enough money to co-locate a server with more than 400GB of HDD space.

1GB (free) is impressive compared to other service providers.