Ofcourse don't sell!
If you want to sell.. Sell it for a high price like 0.01 - 0.02 or something. Or even higher.
Difficulty will in increase, sync limit will be decreased. So mangocoinz will be rare over time.. Be patient, the way to become rich!
You are right. Only 0.6 BTC to be invested in the MangoCoinz system for the price to go to 0.0009, it's a price rise of 4-5X. Waiting for a bit marketcap rise and a price to the moon!