kusama serves two purposes for Polkadot:
as a testnet – ‘mistakes’ on kusama are seen as okay as it’s officially a canary testnet
as reassurance that avax is rock solid
as a showcase-- new tech can be showcased on the testnet
kusama is also going to be selling parachains for less.
and the stock price is quite profitable as well.
it also gives the perception of having a more mature ecosystem.
So you’ve got no downside.
right now, because of recent incident, people mistakenly consider avalanche as the avalanche test net. fast = hasty.