The same disadvantage: many masternodes -- less income to owners. Better spend it for a bounties for promotion and future development.
There is 7 BTC sellwall on mintpal waiting for masternode "investors". Who the fuck will invest 1.5 BTC to receive .056 BTC income in a month. Are you kidding me? People are stupid, but that's the limit. At least reduce minimal verge and offer more BTCs.
So you don't think many people are going to go in for the masternode idea then?
In that case, I'm in. Because if you are correct and no one bothers, then that's more dividend for me!

And that's the flaw in your objection: either loads of people DO bother and the price rises because of lessened supply, or they DON'T bother and I bag loads of BTC from the dividend. Either way, win.
Supply will be much reduced because of this. Also, people narrowly believe that this is the only thing in the pipeline.