The general consensus seems to be a boycott is unproductive. From the pro players POV the demand has been about getting business people to prove they have the means to deliver what they specify on time and as stated. It is not an uncommon request for a client to inquire about the specifics that effect them, especially if they operate on a schedule.
Aside from suggesting better alternatives to the one selected, the consequence the players are hoping as a result of a boycott are unclear. Clearly they don't want the headache of waiting for a check in the mail which is why they want proof of prize money. I doubt they have other intentions, they most likely want a record saying that this particular event run by Barry is considered risky because a failure to prove the prize money is in the bank. (I didn't see a chronicler on the ABP member list, someone to keep official records. But with the internet everything is a public record.)
Reasons for Barry not sharing information like that to the players are because he doesn't want to and it isn't worth his time to share that information. Barry might just be so busy preparing the event, making sure everything is there and ready for the opening. For him to spend an effort reiterating what the ads have been saying about prize money seems redundant. Barry says he will put on an event and it will have a certain amount of prize money, so that is what you can trust, his word. What more do you need? If someone else messes up, then it isn't Barry's fault. He does and has done the best, so take it or leave.