Tellers see multiple people withdraw 1K+ a day. The vast majority of those withdrawals are not for escorts, but for things like cash transactions with non-labor contractors or trips to the casino. My brother in-law's a bank manager (started out as a teller) and he doesn't bat an eye when someone withdraws less than 10K in cash (yes, TEN THOUSAND). If you're frequently withdrawing 1K+, they'll think you're a degenerate gambler. None of them will ever think you're using the money on a provider.