Would gold encrusted fungi be expensive compared to regular fungi?

At that point of time, rockets will be reusable, so it will be very cheap. But then again, they can't afford it, but the Earth will end, so there will be some kind people who will lend them money. Another reason why it will be cheap in the future, is because you convert water to hydrogen peroxide, and water is everywhere. But again, I am thinking outside the box, and this may not be true.