Is a stable way to make coins! It depends on the algorithm of the coins, it's similar to mining.
For example, take a look at the Bitradio coin every block (120 sec) the reward for the master node who validate the block is 0,5 BRO.
Master node is machine that works 24/7 to validate and speed up the network it used a lot in the PoS coins but also in the PoW (like Dash ).
Invest in ICO is totally different. For the profit, it depends on many things. Take a look at #MNGroup or contact me if you want more info.