On a small note,
@C-Nymph don't forget that the feeding effect sticks for several hours.
True, for initial pickup collection it does not make a difference if you play it smart, as we all did when it was a shared queue. However, you have several hours worth of feeding effect, and all three buildings generating troops. So, you do get more out from your Brown Bear during the feeding effect time just by keeping all three buildings active.
If you boost your barracks, you obviously only boost your barracks, but the timers in your mercenary camp and training ground will keep going down one second at a time. You will be able to collect a few times from each of all three buildings with a single feeding effect, getting the bonus on all these pick ups.