The price of the masternode coins is very volatile in a short amount of time, so the actual price of IQ coin and its passive income from masternode could decrease easily during the coming weeks and months.
The best method to make a passive income is by holding the most valuable cryptocurrencies, like Bitcoin, Ethereum, for several months or years.
Price of CRYPTO is volatile, period. Look, the concept of Masternodes is a good one. I personally thought the idea was good and is still good if implemented well but most coins these days have Masternodes without the community of users needed to help make it decentralized. ETH having Masternodes actually is brilliant but shitcoin XYZ having MN is pointless and just makes the same old story of rich guys becoming richer.