May be actually possible. The purchasing power, but also the quantity and quality of fragrance purchases of some, if not most Basenoters may start influencing the turnovers of fragrance market, at least marginally and possibly in the long-run. Perhaps not the best-selling designer houses, though most Basenotes members are regular customers of these too, yet even their most extensive fragrance buys likely go unnoticed among their giant turnovers.
On the other hand, I do believe in the niche theory, so that especially small niche companies may be interested and even benefiting from what happens on Basenotes, since these companies cannot fully rely on the mass-market alone to ensure their turnover.
So there is a quite strong case in favor of this theory.