[atx840]

Yes collateral damage is the risk they could be taking.

I can't seen any advantage in paying a BP from one hand to the other. Keeping it simple.

You have $20 in your right hand.

Right hand gives the $20 to the left hand, you still have $20.
Right hand does not give $20 to the left hand, you still have $20

-$20 spent + $20 made = $0 profit
$20 saved + -$20 earned = $0 profit