Is 2018 the year master nodes officially take off?
Had you spun up a DASH master node at the start of 2017, you would be rolling in the $$$, and still would be making ~$100 a day. Now, who would have known DASH would take off like that last year ...
But, there are still many other coins that offer you a chance to earn passive income, simple for being a running a node. To get a pretty comprehensive (though not exhaustive) list on masternode coins, head over to https://masternodes.online/
Note: one notable coin missing from that list is Smartcash (currently ranked 84 in marketcap).
Is this the year to invest in a masternode? The returns are certainly enticing, and if they take off this year, the earlier one invests the better.