Targeting small teams seems to be a good idea. I can concur that there are many teams for whom setting anything on servers can be an excruciating experience. But, in my opinion, your offering is too broad. When should a team call you? Should they rely completely on you to set their servers? Should they contact you when something gets broke? What happens when you are not around? What happens if you (in extremely unlikely scenario) 'rm -rf' some important stuff?

But best of luck with your venture!