In short, Boom is a longer term project, and HASH will eventually be destroyed by cleverhash when people use it to buy a miner, and the funding raised by HASH and some of the revenue of the company will be used to hire world-class programmers to work on the Boomcoin project.

Further more, think about buying miners using Boom, you not only get 5%, but also, the higher the market price, the fewer Booms you will be paying, so when large buyers like some big Businesses or Business partners of cleverhash prepare to buy some miners, they will be pushing the market price higher to actually get a discount that is actually more than 5%.