There are a lot of scam PoS coins and Masternodes.
They promise you a ROI with 30 days... you can look at www.crypto-coinz.net/ for a lot of masternode coins. But you will see what I mean
You should go for safe projects like Ethereum. Ethereum is not PoS currently but will be in the future, or NEO that produce GAS.
Yes its essential for us to choose legit Masternode POS coin. Almost maximum of masternode coin are scam. So we need to research more about them and need to select best coins.They promise you a ROI with 30 days... you can look at www.crypto-coinz.net/ for a lot of masternode coins. But you will see what I mean
You should go for safe projects like Ethereum. Ethereum is not PoS currently but will be in the future, or NEO that produce GAS.