Is it really producing those many coins per day with a masternode as mentioned on masternode.online?
From my experience with other MN's you can expect to get roughly 70-75% on average of what it says there. some days you may get more but from my experience most days you get less
It will continue to decline as more Nodes come online and when the blocks go into the different reward brackets. Currently there are more than 150 MNs online.