Why interfere with free trade?
There are primary markets and aftermarkets.
You can never predict what will happen in the aftermarket. Believe me, I have learned that the hard way. Prices are more likely to decline than to appreciate, in general. Maybe less so in this forum than in the "real world" but still .....
If the community is getting a cut of the initial sale, then the more initial sales, the better, for the community. If the community needs a greater take, then increase the percentage tariff it receives.
If there is some reason to limit orders to "x" per buyer, then do that.
Otherwise, stop worrying about the aftermarket and whether or not certain people are profiting greatly from earlier investments. You should not arbitrarily put yourself in between a willing seller and a willing buyer.
I am no "capitalistic swine" but I can't help but get the feeling that there is a lot of "sour grapes" emotion here.