Wondering why they structured it the way they did:

1 Ruble spent generates 1 WhopperCoin

1700 WhopperCoin may be redeemed for 1 Whopper

It seems the 1700 will need to change with currency / pricing fluctuations.

Why not structure it as:

1 Whopper purchased generates .25 WhopperCoin

1 Order of Fries purchased is equivalent to purchasing .3 Whopper (.075 Whopper Coin)

etc.

1 WhopperCoin may be redeemed for 1 Whopper

They would need to adjust the reward generation rates of non-Whopper items occasionally to accommodate price disparities between various menu options in relation to the Whopper, but they would not need to alter the redeemable value of the WhopperCoin. This would essentially create a currency backed by food, which is interesting.