for number 1
i think its going to be added work for the BB, im sure anyone who did this would result into a ban as to prevent it!
for number 2
eventually they cant win the bid right?
for number 3
this is a bit complex, i think its best to have a way of checking this. or else its going to be another screw loose on the system of how we do things.,
actually by having withdrawal it gives a lot of loopholes to patch! and added work for gm's and bb's