Create A Forum - Support Forums

I'm wondering if when my forum gets very active with a lot of users blablabla I could migrate to vBulletin. I should buy a upgrade or pay to someone to get the data? If yes how many? Thanks in advance.

Provides high adaptability and flexibility across multiple platforms to add amendments. Offers simple administration, easily allowing to use any type of user, and offers several options. But of course I'm able to say the same for createaforum, this forum system is very good, better than SMF I guess, but just wondering if in the future there's a way to migrate (In the case my forum works very good, little probabilities to that)

$50 for the export but no guarantee it would work with vBulletin.