No doubt but some love to make others do things they don't advertise they do. Maybe having a few hundred dollars to spare gives them the thrill of "convincing" providers.
Countless times an escort advertises as a top and some folks wonder if he bottoms or a bottom who openly says in his profile, he ONLY bottoms for clients and some wonder if he could top.
You're too optimistic!
If he actually was bisexual he would also advertise for men knowing that's the biggest market!
if they accept your offer, I hope you don't expect a BFE. Sex with a real straight guy might be disappointing