I'm surprised that people are selling their coins as cheap as they are, With the latest price you can buy a masternode for $260. The real value is in the link with txbit.io exchange, If (and depending on how you look at it then it could be a fairly big if) the exchange becomes a top 115 exchange by volume (based on coinmarketcap volume) then just that alone would put the ROI a fair bit above 100% at the current price and number of masternodes. (This figure is based on being at position 115 not 1). (If it became at top 100 exchange at the current volume then the return would be over 400%. The payout would be in nearly all Bitcoin as well so no one would be scrambling to sell their coins and smashing the price of the coin down like what happens with inflation or even worse hyper inflation masternode coins that currently happens.
The exchange hasn't even been going 6 months yet and isn't really listed anywhere either and isn't on coinmarketcap so as it becomes more well known then it will get used more etc, you only have to look at the certain big exchange and it's coin to see what the potential is, That exchange has a daily volume 1500+ times bigger than the volume needed to give a ROI of 100% at current figures, Now I'm not saying the exchange will get anywhere near as big as the number one exchange but as it shows it doesn't have to get anywhere near that amount to get a very decent return. Obviously if Bitcoin price goes up you are up even more as well.