If you know what you're doing, you should be able to figure out a break even point, but it's probably more than you would want to spend, and getting people to s

If you know what you're doing, you should be able to figure out a break even point, but it's probably more than you would want to spend, and getting people to sign up is likely difficult. One of the bigger issues is support. Do you really want to be responsible for why your neighbors kids can't get on wifi?