Waiting for my vote to update:
I thought making this update might be as simple as adding a some javascript. But as @anyx said:
if you want to see the actual values, you have to perform the transaction.
So my proposal is to create a setting that hides reward amounts.
Reasoning
Most steemit investors spend a lot of time curating and voting on content. If we just care about content, then making us wait just so we can see the rewards update is unnecessary and slow.
The number of people who voted (the people icon) would still serve as an indicator for popularity, as would the number of comments.
And sometimes we do want to see how much money a post has generated in rewards, so there should also be a mechanism to show rewards for individual posts.