Hello sir, I would like to purchase 2 systemnodes for 1000 crw. I want to know how much income it can generate per month?

The rewards for an individual system node will be a function of the total number of system nodes -- so one can't make a precise prediction.

With each block, a system node will randomly be selected as "leader" for the that block and that system node will receive a 0.9 CRW reward. Blocks currently complete about once a minute.

There are 1440 minutes in a day (24 x 60) and very close to 1440 blocks per day. So each day, the system nodes on the system will receive 1440 different 0.9 CRW rewards for a total of 1296 CRW going to system nodes per day.

And then this is where the math starts to get interesting -- because masternodes require 20x the collateral as system nodes, but receive only 5x the reward of a system node. Masternodes get 4.5 CRW per block... and there are currently about 1,200 masternodes.

Now, if VPS or compute were free and governance voting weren't an "economic asset" -- in a network with the reward and collateral structure proposed for CRW, the equilibrium between the return on masternodes and system nodes is that if there are "X" masternodes, then you would have 4*X system nodes... in other words -- if 1,200 masternodes stay up, then the return on system nodes will be higher than the return on masternodes until there are around 4,800 system nodes in a zero VPS/compute cost world... in the real world the return breakeven will depend on the cost of your VPS -- but the equilibrium is probably around 3x as many system nodes as masternodes.

Why more system nodes?

1. In the long term, system nodes should be able to do a lot of grunt work for the network -- so you want more capacity and diversity, more numbers in this layer... and you need to set it up the way you want it when you start, not later.

2. More people have the ability to own smaller stakes, so in terms of building and engaging the community -- you want to have more seats at the smaller collateral level, as way for people to start and get to know the community and think about how they can add value to the network -- what ideas they would like to propose or contribute.

Or that's the way I think of it. Others may explain it differently.