NV05, it's a noble idea but the market is really saturated. Unless you're offering something the others cannot, you're not going to make a whole bunch of money on it. See my sig - I dispatch for APSN also, and know the owner. He's told me he really doesn't make a whole lot of money on it - it's mainly something that we do just for fun. It's kinda cool to see an incident you paged out end up on the evening news.
The only way I could see you standing out over everyone else is if you paid your dispatchers to sit full time and monitor. But that would be costly, and the ROI just isn't there to justify such a thing. Most paging systems are volunteer based and well, you get what you pay for. Some are very active and some have hardly a peep go out.
Good luck with it,
-AZ