Assume that one person works full time on it. $5,000 a month is $60,000 a year. Subtract hosting costs and it's a relatively low income for one person who has the skills necessary to build and administer such a web site.
> not too shabby
It is actually a little shabby.
Perhaps in many parts of the US, but plenty of places elsewhere in the world, this is a really attractive salary.
you're greatly overestimating the difficulty of setting up a forum and the costs to have 15,000 active accounts with 1 hour viewing time.
Given the above is true, I have a proposition for you: I will pay you whatever you consider fair payment for fifteen minutes of your time to set me up a web site with an income of $5,000 dollars a month.
I've already provided instructions on how you can trivially setup a phpBB forum using cPanel.
This statement is incorrect. You haven't provided instructions on how one can trivially set up a phpBB forum using cPanel.