The key is to have as much redundancy as possible.
That's why I cringe when I hear smug masternode holders talk down to miners...
It would be like me trying to get rid of the bacteria in my gut, not realizing that they help me digest food and that I will die without them.
Smug? I mined my first Masternode and bought the rest all the way up to 0.019. If miners whine that Masternodes are 'too profitable,' nobody is stopping them selling some GPU's and buying a Masternode too. They'd also save on electricity!

I am questioning the 80/20 split because I think Masternodes bring more to the table than miners do, that's all.