Another issue you’ll run into is this scenario:
It’s a NFL Sunday morning at 11:00am EST and you withdraw $1000 from Book A to Book B directly.
Suppose it’s a book like that BetOnline that’ll pay in under 15 minutes. They send the Btc at 11:15am EST. Great.
You wait and you wait but the Btc doesn’t hit Book B until 1:30pm EST. Too late, you missed kickoff.
How did this happen? Because you have no control over the sending fee that BetOnline used so it took 2.5 hours get confirmed.
Had you been in control of the Btc at 11:15am you could have sent it with a higher fee ($2-3) and it would have hit Book B within minutes.
This is just one example of many why it is not a good idea to send Btc directly from Book A to Book B.
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BAUS
Doesn't make sense. If BOL's sending fee is too low, then the transaction will sit in the mempool regardless of whether you send to Book B or to your intermediate wallet. Both of those destinations are just bitcoin addresses and the bitcoin miners use the fee to prioritize or deprioritize your transaction for inclusion in a block. The direct book-book transfer will again be faster.
What you've written is a justification for keeping some BTC in your personal wallet though. The problem there is of course that BTC is highly volatile so keeping the money there means you might lose a bunch of value.
BTW sorry if my comments come off as adversarial. That's not my intention.
