Yep, this scenario does happen often, but not always. Here they are offering you "High ROI Masternodes - upto 800% ROI with 100 MN", so if you are interested in setting up a masternode, you should buy it now, because the masternode rewards will reduce with the time.
You have a point, but buying a masternode is it really safe? How to be sure that we will really get 800% Roi with 100 MN? Im interested but I want to check first if this is true. I hope someone will buy this and prove to us. Anyway. I hope masternode will not reduce much.
You are right about safety, I noticed that there are many people here who set up their mastenode and some of them face problem with that, but I think the problem solved. I just want to tell you, keep in mind, in most scenarios the only way to make some profit with coins like this ( masternode ), is to get it early and sell it in its high price.
But the listing price is as far as I know high in Cryptopia; something between 1 or 2 btc. 