Approximately how much KMD does a notary node mine each month?
1500
Currently that's 1500*0.00037000*2558=$1419.69 in a month. With a low rent you can live on that full time. When KMD rises and multiplies that sum will also rise and multiply. After the BTC event coming up BTC could rise to up to $4000/BTC this year. It was originally stated that they should get about $500 each month "get the ~$500 per month". When notary node operators dump KMD and profit in BTC and then in $$$ the KMD rate decreases.
https://support.supernet.org/support/solutions/articles/29000010574-notary-node-electionsRunning a notary node is like having a money printing machine, that's why you only get one if you get elected. Jl777 is such a generous guy he sweetened the deal with the $500 per month subsidy until kmd price reached break even point, so notary node operators were never out of pocket, they just had to learn the tech setup and stay active.
I'd give a testicle to get a node spot in the next election!