You are right.This idea makes no sense but i think JD should have reward system maybe based on wagered amount(you already creating stats for that) ? 25-50 clams out of 1200 daily will not hurt investors and should make site more attractive for gamblers.
It's a zero sum game. It hurts investors exactly as much as it benefits gamblers.
Taking 25 CLAMs per day from investors and giving it to gamblers hurts investors by an amount of 25 CLAMs per day, and benefits gamblers by an amount of 25 CLAMs per day.
I think it would make more sense to simply reduce the house edge from 1% to 0.9% and achieve a similar effect. Both take EV from the investors and give it to the gamblers. Both modify the incentives slightly to make it less attractive to invest and more attractive to gamble. But is that what we want to do?
(The average daily wagered amount is roughly 25k CLAMs, and so the average daily EV for investors is 1% of that, or 250 CLAMs; giving back 25 to 50 CLAMs represents giving up 10-20% of the house edge, making it effectively 0.8%-0.9%. Note also that under your scheme the effective house edge gets bigger as the wagered amount increases - the rewards get spread more thinly to the gamblers).