Lets see, at $1k, MN income is $6500 per month with zero costs. At 4570 nodes that's $30 million being effectively given away by the blockchain monthly with no counterbalancing investment in the chain scarcity as happens with mining.

The selling pressure is enormous. Think to yourself if bitcoin reduced the mining difficulty to zero for half its miners. What would happen to the price ?

That's all a masternode is - a zero difficulty miner.

So while 1k may be achievable in a pump, is it sustainable ? No because the asymmetry in profitability quickly crushes any revaluation back to a sustainable level.