Is still possible to buy MN?
Can someone share what is ROI for LOL MN?
With how many coins per day MN is rewarded?
Yes you can still buy one but the Raspberry PI 3 package has sold out. So you will have to set up a wallet on your PC.
Taken from white paper:
Block reward or incentive of holding a masternode to be voted on by first
100 masternode holders/investors. Projected to be around 45% to 50%