Masternodes are but one component of Stakenet's ecosystem - a hybrid staking/MN network where block reward payout is split 45/45/10 between staking rewards (consensus), MN rewards (2nd layer), and a treasury, respectively.
This 45/45/10 split ensures a balance of representation between the MNs and the staking network by making over-representation of one over another increasingly unprofitable. There can only be so many masternodes running before the incentive to stake and pay less in operational costs becomes the better option and vice-versa.
This is not me saying a bad thing about Stakenet or Masternodes but I have had a lot of experience in staking projects,,, as an amateur and even tried to invest a little bit into getting significant stakes in some projects but my feeling after all that is that in the end only the whales can make a profit and even so at good calculations like you do.
Staking and MNs for some reason does not reward the small players enough.
Stakenet is SO cheap that you can become a "whale" for a tiny amount of money. If you look at the upside potential ($10+/coin). Staking becomes extremely lucrative, even for small holders. The fees involved which is shared among masternodes providing services is what will earn the most though.