[SamuelAdams]

It depends on your business and your clients. Maintenance in the form of compliance always sells, albeit begrudgingly. If maintaining various compliance requirements is required (like DoD), then maintenance budgets are usually flush with cash.

[mcmcmc]

This is very true. I work in MSP not software dev, but banking/finance clients almost always have budget for regular hardware refresh and premium support agreements. And they fork over tons of cash for security auditing and all the licensing.