After acquisition of noun 5 it is of precedent for the price of SHARK token relative to ETH to increase. There is an incentive for early adopters to be rewarded for getting in at the beginning and this follows that notion. If this proposal were to pass this would mean that for every 1 ETH added to the treasury you would get ~786,000 SHARK.
Pros: You can't get SHARK token for cheap and the early adopters SHARK becomes more valuable.
Cons: People who get in later don't receive the same amount of SHARK and might feel discouraged from joining all together.
Note: This discount rate is compounding meaning that we are adding a 7.5% discount rate to the current 1 ETH= 850,000 SHARK to 1,000,000 * (1-0.15) * (1-0.075) = 786250 SHARK.