The Frost demons do a very simple thing to earn a living they are traders but they don't trade food but planets or rather they come to a planet, enslave it's population or kill it then they sell the planet to the highest bidder while using the slaves as a workforce easy but there is an obvious problem they constantly need more planets so what Sycamore proposed is that he goes off and kills civilizations, notifying Frieza force of the location and finally Frieza sells off the planet while Sycamore looks for more planets to destroy that is at least what King Cold thinks