Out of interest, why do whales receive more coins which lets them setup more masternodes? If I own 1 masternode or 10, my share of the supply is increasing at the same rate. Do you mean the whales can get the next node faster? But i can just put the difference into a shared service and take a 20% hit which is not much different?
There's faster compounding interest for whales since the wait time to setup the next MN is shorter. Yes, in theory one can use a fractional MN service to improve returns. In practice I bet it's not done very often due to needing to trust the MN hosting counterparty. And the 20% hit eats returns a little bit.
But those whales are investing and risking a commensurately "larger" sum in order to obtain that "faster" interest. Whats the difference, economically? The opportunity and risk is there for any size investor. How is that different than large miners who reinvest their bitcoins into more mining rigs to get more bitcoins? They can accumulate the funds necessary to buy new rigs earlier than the small miner, which in turn allows them to be "faster" at finding blocks while the small miner stays the same.