They also thinking feed until let you whack till sian.
In any case, the game prevent you from feeding more than 10 berries within 30 minutes if I am not wrong. So don't think they will worry about bleeding gb.
For those die hard security guard, the most you can do with single person take down is just take out one or 2 Pokemon from the gym before they put back again after 10 minutes cool down is over. So for such cases, you better have their same color and slot in before them.
However I have encountered some really pro security guard where they will be able to shave you out even if you managed to slot in last.
That is shaving at a whole new level.
a) yes 1 acc 10 berries, if all 6 in, its its 60 gb , NOT forgetting non defender acc which mean 6+ X accounts, so if addtional 4 not in, they can feed 100
b) yes its easier to take down any pkm so long is non blissey being chansey and snorlax is the hardest due to high hp( then again each gym max only can have 2 of these, i usually focus hitting out others)
c) same colour of cos have, if i up, i cont to hit ttt first 5 i dun touch mine
then cont to grind till mine out ( free coins)
d) as an attacker, i know how to take them out, means i know the tatic to def ( if i am phsyically there)
like esso slogan, we are drivers too
when u attack u know the mentality of the defenders, play a few time boot them out.
for them to put back, is for pride purpose only
they lose gb saving be it wanna roll or for the day,
it doesnt make sense to def but for face, they have to
for me i gave up trying to earn coins in neighbourhood,i just want gym xp
for town gym its easier, u keep grind, ppl let go, even spoofer also not keen to def for long
but i din know @delardino got 900 gb ! he got the sources to play....
for me i just tap for the sake of tapping, cos no space for pokeball this sun.