Giving an URL when you purchase?
 

I heard on here before that when you purchase vBulletin you have to give an address for where you will be hosting your site. I have no problem with that, but I have a question: Can you change the URL listed after you purchase?

I've basically got this situation: I have a gaming site now that I may switch from wordpress/phpbb3 to the vbulletin Suite, but there are a few important outside factors involved with that which will decide whether or not I actually can make the switch on that site or will have to go with some special custom alternative. My other project is a new site I have been planning for which I will run using vBulletin Suite and vbSeo and a number of other add-ons.

So here's the deal: Since my current funds only allow for one purchase and that money comes from the ads on my gaming site, can I register for my gaming site, and if I end up not using it transfer it to my other new project? Just, change the URL or whatever somewhere in my registry?