if you think you are going to make any money off this, you probably wont.
what you will probably do , is lose your hosting account because the bandwidth will go up or whatever, and you won't be able to pay for it.
( this is what happens to about 90% of the free bulletin board sites.)0
then guess what, all of those people that signed up for your free boards, will just be out of luck. you can't give them a database backup, so all of their boards and members and time etc. will just go up in smoke.
also, as stated earlier, when you don't know how to run this, your members will be coming here for support and they won't get it, because we can't support that type of installation.
are you getting the idea that nobody here approves of adding one more to the thousands of these types of sites already out there?
but hey, good luck to you.