i'm pretty sure the last idea i proposed on part two would work fairly well. have the script watch bid activity and when it looks like there's only one other user using bidbutler, turn it on and let it spend money. as soon as a third user starts using bidbutler, turn it off to save money and let the other two fight it out. since both users probably won't use the same price ceiling, it should be pretty clear when one user drops out and the other keeps bidding with bidbutler. at that point, turn it back on and repeat until you're the last one using bidbutler.
i'm pretty sure the last idea i proposed on part two would work fairly well. have the script watch bid activity and when it looks like there's only one other user using bidbutler, turn it on and let it spend money. as soon as a third user starts using bidbutler, turn it off to save money and let the other two fight it out. since both users probably won't use the same price ceiling, it should be pretty clear when one user drops out and the other keeps bidding with bidbutler. at that point, turn it back on and repeat until you're the last one using bidbutler.