Thanks for your comment.
Then there's the big one, how much are they extracting. What are their total earnings and how much are they selling vs powering up. Simply subtracting their current wallet value from total earnings would give a good idea on subtraction vs building. If I can think of more I'll be sure to come back and throw them out there.
This one is actually the KE.
KE is "Total Earnings" divided by "Staked Hive". If the value is 1, you've converted all your earnings to staked Hive. A higher number means less earnings staked, so more 'withdrawn'.