[codetrotter]

> You'd have to compile and run your own server, which is more expensive than the $1/month they're asking for.

For people like me that already rent a VPS for their mail and website the marginal cost is $0 except for the time it would take for me to perform the installation and setup.

If the system is good and stable then the "cost" of the time that I would spend installing it on my server would be close to $0 when divided over the amount of time I use the software in the future.

[woolvalley]

I think another plus of buying their service is your supporting development of the software and saving yourself time, while a critical piece of your security software remains open source.