1500 KMD @ 3.90 = 5850 USD at todays prices, and this is AFTER recent crash .... and another guy does the work. Even if you paid that guy 2K USD a month, you're making ~1000 USD a week - who reading wouldn't want this deal? No risk, no stake, no (compulsory) work.
Don't underestimate the effort required to keep a notary up and running, and it's only going to increase as more assetchains come online with dICO's. We need reliable nodes, and if you pay peanuts you get monkeys. I hope the pendulum doesn't swing too far the other way, Yes, there are some guys sitting back making good money today who pay a manager to run their node, but early adopters always get those amazing deals, like mining bitcoins in 2010-11.
If we drive down compensation for running notaries too far, and break things, it's actually worse than having a few early adopter fat cats creaming off the profits.