I used one credit = one dollar to keep it simple.
The actual price could be set once a quarter based on supply and demand.
The average grandmaster credits earned (supply) should be about the same as the average member credits purchased (demand).
The price could include cents, for example, USD 2.50 per credit (token).
This idea should only be done for grandmasters, it would be a mistake to use others, like international masters, it should not be watered down for any reason.
You want to attract both grandmasters and customers.
Start with one credit = one dollar.
Warlord
Would you like to play with a grandmaster?
I watch the grandmasters playing in live chess.
Step 1
Time control is blitz 3 + 2
Step 2
For any grandmaster vs grandmaster game in live chess at this time control the grandmaster that wins the game earns one credit.
Step 3
Any member on this site can buy credits to play with a grandmaster. One credit = One dollar.
Step 4
The grandmaster has credits, you have credits.
You go to live chess and select the "Play the grandmaster" option.
You are matched with a grandmaster and you play your game, or games.
Conclusion
The grandmaster first has to earn a credit, then he has to cash in the credit.
You have to buy credits and get the chance to play games with grandmasters.
More grandmasters that play each other and play with regular members means more customers for chess.com
Warlord