Of course a crystal ball would be useful in the deciding what coin will flourish unless you do some really solid research and possess some accurate insider info, but that's another story. That being said, Shadowcash looks kind of interesting to me, I will take some time and look into it a bit further.
Hmm,
Sorry but No , it would not be a good investment , it would be a speculative gamble mostly suited for Venture Capitalists that already do win big and lose big but have so much fiat , it does not hurt them either way.
Holding a coin that has no or extremely low interest rate is the same as buying a silo of corn , you pray when you sell that you get a higher price than when you purchased it.
But there are 0 guarantees , and odds are you will lose money as more coins are created or more corn is growing.
Increasing Supply without an increase in Demand Always Lowers Price.
By having a rate 5% or higher you give the investor a reason to hold a % of the coins, so they can make more.
Basically a reason to hold the majority of their coins and only sale all or a % of their stake.
You guarantee a large % of those coins will not be sold , but used for the Utility Purpose of Creating more.
With no or extremely low interest rate , there is no real reason to hold but speculation, as it's Utility of creating more coins is negligible , and most will sell all at a loss when they need capital as they are not VCs with massive amounts of fiat backing them up.