1000

If you have heard me talk, you have probably heard me mention the Tribe of 1000. It means that for most ISPs, WISPs and other service providers, 1000 profitable customers is a good business model. The key is Profitable. The other factor is that you aren't aiming for a million. You are building for 1000 or 2000 or 5000.

Here is a blog post explaining it.