What is the ExtraProfit and how can I earn it?

On the first day of every month SixthContinent resets the credit wallets of all the inactive users, and redistributes these credits through a special reward for the top spender members: The ExtraProfit.

The ExtraProfit is a reward for those members who spend $300 (or multiples of $300) within a month.

e.g.

$300 spent in July, you earn 1 ExtraProfit;

$600 spent in July, you earn 2 ExtraProfit.

So if you want to earn lots of extra credits every month, reach the threshold to obtain one or more ExtraProfits.