Nope, I am correct. You pay for a vbulletin licence. That does not entitle you to access to this site (or even the vb.com forums). It allows you to use vbulletin and also the support system.
You are wrong. There is nothing mentioned about your affirmation anywhere in vBulletin Members Area or their license agreement. It is stated clearly that you can have access to a variety of support forums. On top of that, the license owner can decide what vBulletin Support Forums he/she can access.
From vBullettin Site:
Home ? Support ? Priority Forums Support
By opting-in to the priority support service, you will be able to access customer-only information and resources on a number of vBulletin forums for as long as your vBulletin customer account contains at least one active vBulletin license. To utilize this service, you must first check the box next to the forums that you wish to participate in using the form below. You can then register on the external forums using the same email address assigned to your customer account.
If you would block my access to those forums, for any reasons who does not violate the Jelsoft and vBulletin license agreement nor the site code of conduct, rest assured that I will sue Jelsoft instantly. Especially when I have over $1,500.00 worth of vBulletin licenses.
In other words, only Jelsoft can decide who cannot have access to a vBulletin site, based on the above mentioned facts. Since you are not representing Jelsoft in any way and you are granted administrative tasks to vBulletin.org on a pure volunteer form, you are not allowed to ban anyone from vBulletin.org forums.
I hope this answers your questions and will determine you to think twice before you affirm something in public that can be associated with discrimination and harassment, in a court of law.