I also start STEEM flows monitoring. I think it is good to have a whole picture, but not only vesting flow. The operations stats for last 22 hours (~26k blocks):
current_block: 4913425 (#26287) time_stamp: 2016-09-12T19:13:30 (22:01:30)
pow2_count: 1254 (avg: 20.9 blocks, each 0:01:03.19)
transfers: 1067
to_exchange: 142 (35894 STEEM, 11335 SBD)
from_exchange: 72 (23334 STEEM, 26355 SBD)
between_users: 676
between_exchanges: 53
to_null: 124 (638 SBD)
vesting: 125 (33165 STEEM) withdraw: 33 (2581559422 VESTS)
convert: 49 (0 STEEM, 11516 SBD)
You could see that vesting is not a main trend. There are a lot of withdraws as well. STEEM flow out to exchanges, but interesting that more SBD than STEEM is returning from exchanges.