You can buy more and more defi coins to be stored into your wallet. Stake is just like a feature that being offered from that platform. As a user you can choose whether you wanna try to stake your coins or keep it in your wallet. it doesn't matter whether you wanna get the passive income from your coin or not.

Majority of buyers will always take the opportunity to get more profit from the market. I should remind you that if when you can get more and why not? That's not a mandatory but that's worth when you are staking your coins.