While I'm not a lawyer? (Lucky me!) Additional licences are, AFAIK, available only for employees of the owner of the main licence.
Since babagre does not state his or her country of residence, I have to assume that to be the Land of the Countryless, i.e. the U.S. of A. Therefore he or she can, technically, just let his or her partners or business associates to install any number of copies of VW from his or her installation-DVD and no-one will be any wiser.
Thus, there is no advantage from adding another seat. Costs money and may be illegal anyway. Just get the one upgrade and ?share? it, as encouraged by NNA.