Let me take myself as an average example. i have around 60 cool plugins installed for my forums for
FREE.
Now, imagine all of them are paid...
That would force me to shell out a whopping (60 plugin x $30 (at least)) ==> US$1800 per annum, which literally means that poor webmasters like myself, wont never be able to enjoy most of the coolest products anymore...
I think, i would ideally stick with vB.org's present policy of only encouraging FREE community of hackers. Coders with paid PRO versions can always advertise their products in their signatures as presently being done by many. I see no problem with that.