In terms of value, I think it's going to be more about avoiding anti-value—specifically, I expect that accounts lacking the checkmark will be seen as spam, scams, or bit players.
Here's what I expect to happen:
1) First, Twitter introduces paid verification. They cut back on their content moderation efforts on unverified accounts, but they exercise more control of spam and scams on verified accounts, including permabans (which are easier to enforce, due to better knowledge of the people behind the accounts—a credit card number, at the very least).
2) Next, they introduce an option to hide all non-verified tweets, other than from people you follow. People will use it because non-verified tweets have a much higher proportion of spam and scams.
3) At this point, they've successfully price discriminated between professional content creators (such as myself) and consumers / casual creators. I expect additional price discrimination to follow, such as charging for API access in order to target people using tools such as HootSuite to manage large fanbases.
All of this is predicated on people adopting #1, which is why it's important for Musk to find the right price point. It looks like he's just spraying out ideas, but I think he's doing price research.