This doesn't take into account startups who have SLA's because they have a B2B product. We have both B2C and B2B customers and as a result we can't be down for our business customers or we have to credit them. Honestly, 99.9% uptime is not hard to manage. Pick the right colo facility with a history of good uptime. Have more than 1 machine, and have them on redundant power supplies (on separate PDU's). Voila, unless you screw up deploys, you have 99.9% uptime. This doesn't take a huge amount of money.