When is a VPS / hosting business profitable
**I'm not going to start one up mysqld, lets be clear, I've outgrown summer holidays... **
But I was wondering, when is a VPS / hosting business profitable? You need servers, colo, bandwidth, solusvm / whmcs / cpanel / directadmin etc licenses, pay for staff, pay for office (or parents cellar), and that all returns monthly. How do small businesses make it around? Maybe people can give some numbers?