That probably sounded like I'd kinda written you off, but what I'm meaning is, let's not go wasting the license on a forum with a bit of a cloudy future.
We'll see how it goes, and if it becomes popular vBulletin could be an option, see?
Well, you have to buy a license to run vBulletin legally on your server.
There's two options: Leased Licence ($100 or £55) which enables you to run vBulletin on your server on a year. After that period, you have to either upgrade to an owned license or remove vBulletin from your server.
An Owned license allows you to run vBulletin on your server indefintley. It costs $180 or £100. I currently own an owned licennse.