[Brad]

It really depends on what you agreed to when you downloaded/bought these styles, I am sure there is something in there that said you could not re-sell them.

I don't see a problem selling a copy to someone that bought the vB2 version, in my mind you are just charging these guys for the time you spent converting the style. But I am not the copyright holder of this work. So if you agreed to something that said you could not do this, and the copyright holder found and and wanted to sue you he might have a case.