We should not compare masternode with stacking coins. That minex parking is pure ponzi and it crashed already. But I had some bad experience with masternode coins in last year also. If some masternode coin becomes popular like it was chaincoin at one moment, so many people created masternode that % of coins that you got from mn became ridiculous! Ane when people figured that out coin crashed!  And there was Aspect coin that was pure scam, they were selling mn via discord, they had wallet, coin was mined, it lasted few days and then they just disappear. I'm sure that there are a lot of examples like that.