// @audit this is checking the already-set storage variables, not the parameters
require(maximumBoostPayment < 1500, "over max payment"); //max 15%
require(boostRate < 30000, "over max rate"); //max 3x
require(_max < 1500, "over max payment"); //max 15%
require(_rate < 30000, "over max rate"); //max 3x
