The fact a coin is traded somewhere doesn't prove if it's a legit coin. Bitconnect was also traded on many exchanges and was a scam coin. I don't compare Bitconnect with Minter but a coin listed on exchanges doesn't prove anything.
In addition, most PoS coins with high returns are often ending up as dumped shitcoins because all the stakers are trying to sell them but there are no buyers...
That is true, I see most of the users prefer stake and sell and price eventually goes down. The dev team bets on projects, that are based on minter custom coins that will boost the economy. I saw a few games that use custom coins for internal bonus programs - great use case, I think! but adoption will not go fast. Also team is building an exchange where project owners may sell bip with priority. Doubt that this will work, but who knows, I really want to see this in action. The network still in it's early stages and all good new projects are very welcome by community. Also low prices is good for new projects that wants to enter, hope there will be more of them in the near future.