I have very recently looked at becoming a isp. Cogent will work with Small ISPs, hundred megabit connection is around $325 per month and a one gigabit connection is around $1200 per month. My intention was to bring it out via wireless and that Equipment is easy to figure out and do the problem is that it ended up being around $1500 a month to get roof rights to get the darn data out from a carrier center which was only 100 yards from my first POP.
The capex "capital expenditures" you can expect to be around 7 to 30K depending on number of initial customers. But in this case my opex " "operational expenses" were to great. You will see in my case I would have to have around 50 customers to break even, and that's just offering 20 meg service. To get where you could start making a real wage and take a day off you have to reach 500 customers. So if your ever really thinking about doing this stuff do some real research.