Also, I'm sure that the masternode opperators will vote on things that benefit them the most to increase their holdings...
And then masternode operators would be left with worthless coins in their possession pissing off everybody (miners, investors etc).
Do you even understand what are you writting or are you just having fun?
Masternode owners will only vote for what's good for Dash because they're long term holders and want their investment to increase. How can they do that? By growing Dash.
Example, Greedy MN owners want to take more of the block reward for themselves so they vote to increase their share to 80/10/10 allowing all the miners to leave. Now the security of the hash has been compromised, compromising the system, users leave in droves and the whole network collapses.
And it wouldn't take long either.
You can see, every decision will and has been weighed heavily against what is best for the project BECAUSE they're so heavily invested in the project.
The main point here is that there is nothing that the Masternodes can vote on where their interests are not aligned with the Dash Project.