---
For the month of August, my secure node averaged 0.048325 ZEN/day. The APR came out to 37.26%. The APR is lower because I have more than 43 ZEN in the wallet. I started with 43 ZEN back in December 2017. I have been collecting ZEN in the wallet trying to figure out what to do. At my current rate, I could start another node in 03/08/2020.
Since any balance over 43 ZEN is not contributing to it's growth, I am not sure APR is a valid metric for this type of investment.
as far as I know, you need 42 ZEN to run secure node.
It does not matter if you have 42 or 80 Zen in your wallet, you can run only one node with 42zen. So you earn rewards per one node, where is collateral 42 ZEN.
here is the difference between a secure node(masternode etc...) and staking. For staking more coins in your wallet means more stake rewards to you.