It's true and a good reason not to get attached. You may have a great thing going and then some silly cow puts the wind up her. I mean there's WGs that are excellent in every way enough to see thru the rubbish but there are also many in between. She might be part time or new or just not have the inclination to ferret out the truth on someone. You email her for a booking, she thinks yes, then she sees a note left by someone saying to avoid you. It might be fake it might be not, so she simply confirms with someone else who wants to book her instead.
By the same chalk, it's really not worth the while wondering why. Shit happens and isn't always fair. Just move on and rubbish gets forgotten. Unless you're a real fucking psycho, there are plenty of WGs prepared to give a decent punter decent service.
What more could a man ask for?