You bring up an interesting point, but I feel like MNs do offer positive aspects for the coin. They basically acts like a loyalty program because once you hold the coins to activate a MN you can't dump your coins unless you give up your right to run one. Furthermorethe coin lockup creates more demand for the coin. In essence a 10 million coin supply will be reduced to 4 million with a 60% lockup. Even if someone doesn't have enough to run a MN, the increased demand would be good for them. Finally you have a community that is always looking out for the best interest of the coin. I may be missing something, but it does seem like a win/win.