How are working girls supposed to change if you can't give honest feedback
That's a very naive comment. Nonetheless, that is exactly why I tell them very directly and in person. However, all WGs who have inaccurate pictures and/or don't deliver the services they promise obviously know that's the case, therefore, at the very least they will strongly suspect that must have been a factor. Nonetheless, I like to make sure it's crystal clear for them.
Still, 99% of them won't care or at least won't care enough to change (because they didn't care about being so misleading in the first place).
Even if everyone who walks did tell them why, they will have enough punters who won't walk so it just doesn't matter (even though they obviously won't come back either but there's plenty more where they came from).
At any rate, as others have suggested, a punter should look after himself first and foremost as the WG is not his concern. If you do tell them up front then there is definitely a risk of experiencing something nasty, even if it's just the girl getting angry (which is the only thing I've experienced - except once where she called her pimp, who himself shouted down the phone "I'm gonna do his fuckin' head in").
There are a number of bad things that could potentially happen which aren't worth risking such as a shouting match, violence, her very nearby pimp getting involved, her chasing and shouting at you (even down the street), her or someone working with her following you to your car etc.
Obviously they're all rare but they have all happened as well and not worth the risk (I just like a bit of risk sometimes but it's not advisable).
One also shouldn't give a shit about the WG thinking they're just an "address collector" or whatever. At worst you might get a warning on SAAFE or something but the kinds of girls who would do that are also not the kinds of girls who would have really misleading pictures etc (at least not usually).
Nonetheless, I do think the best balance is to use the "left my wallet in the car" excuse (or something similar) AND, once you're safely away, text them the real reason you left. This is the best of both worlds IMO. I just like to do it in person because it's more "personal" and that's how I like to do a lot of things (despite what my post count suggests
).