[jmstfv]

As someone who built and sold an uptime monitoring service - don't*.

You will have a hard time attracting customers as most common marketing channels are very saturated.

*unless you're going to approach it from a unique angle AND have access to a customer base; even then, it won't be a walk in the park

[quickthrower2]

Yeah, now that you say that it sounds a bit like starting a pizza restaurant I guess: hard work. Probably harder as the Pizza restaurant has physical presence and proximity, where as online, it is more democratic: we are all equally shouting into the void for attention.