I think you may be overestimating the situation as Boosters being used as an exchange medium. The reason that is not as you assume is the due to the boosters dropping in game.
Most people would rather just purchase it directly from the broker where it is a few seconds of typing booster into the search and being secure in knowing that you got the booster rather than trying to haggle with someone and hope they actually give you the booster after you give them the plat.
Plus, I think you would end up losing money by purchasing boosters for plat.
1 booster from broker = 5 plat
1 booster from SoE store = $3
1 plat from seller = ?
using boosters like Gambit from X-Men to kill Naggy = priceless
