There are many who have got there profits from PoC backed MASS. One thing you need to keep in your mind is that whatever you wanna do with a coin do it when its on its initial stages. Once a project goes to final stages i.e. its launched or is on exchanges its very difficult to gain profit.
crypto market is about buying the right coin, at right time and on right price. If you misses any of these filters then it become very difficult to get full profit. So those who have bought mass well on time can gain maximum profit from it just like whales invested in bitcoin well before public jumped into it. Always invest wisely and timely.