Because the minimum cost is $10/mo for Rackspace email.

I personally have switched between payed google apps for domains and fastmail (those are both $50/yr and under).

Re: rackspace, you can always sign up for a trial account for something else, and once you're in, get the single email subscription for $2.

This is why I would never start a business in this space. You're saying $10/month is too much to protect the privacy of your email.

I think for most people, $10 IS too much. Although we all talk tough about privacy, most people (even here) don't have much to hide from anyone, and when the difference between definitely secure, and probably secure (in terms of privacy and ownership of data) is $10, it suddenly feels a lot more expensive.

Which takes me back to my original point. :-)