By keeping the liquidity locked it would mean you cannot take out your ethereum that you contributed to the DAO treasury.
Pros: Opening and closing liquidity requires 2/4 multisigners and currently our system is not the best to get them all together at the same time, it let’s our multisigners breathe a little. Additionally it allows our governance proposals coordinated via snapshot to run more smoothly as votes cannot be faked by people adding ethereum to the treasury, voting, then taking it out.
Cons: The downside to this is that people who don’t want to bid on nouns 3-9 can’t get their ethereum back.