Marcelo is not responsible for the MHS prices.
It's a market and users set the prices.
Marcelo is responsible for every aspect of the MHS value, from rewards to the ability to withdraw.
It's a great cop out - make the site as dysfunctional as possible instead of simply running away with the money and then blame the "market" for devaluing everyone's "investments".
Doesn't make it less of a scam, but nice try.