Minexcoin with very low trade volume would resist serious investors.
Agree, but interest rates of Minexbank allow the trade volume to be changed quickly and easily. It is not yet a time to increase trade volume. Besides for the health of any crypto coin it is better to have plenty of small investors then a few of big ones.
The problem I can see with those small trade volumes that the coin price can be easily manipulated. How that fact impacts the 'health' you mentioned?
You forgot to include the trading bots. Livecoin is small that's for sure but when someone pumped the coin, there is a huge risk of loss because a portion of MNX holders will surely dump for profit and rebuy again-PARK. The element of parking reward adds up to the risk. So there is less risk of a pump.
And what do you propose to do? Large exchanges require very large investments so that the token is flooded and free only on stock exchanges where everything is even worse.
Urgent need of speed without them the project will simply fade with time.