Why do some guys ask these questions....even though the provider has a bunch of reviews that clearly says she's the girl in the photos?

there is such a thing as a "cop check", or that cops cannot lie in order to conduct a sting. Most, I suspect are the ones who use BP almost exclusively and have no clue that hobby boards exist or how to find them/reviews.

They are newbies.

And they are good at it b

A WORD TO THE WISE.  Police are trained to lie and use your statements  against you.  The police can do anything in order to make an arrest. This includes them getting full frontal nudity.  
You can believe this warning or not it's up to you.
Be safe out there all.

To know they lie all the time. Even on the most popular TV reality show out there. Criminals ask practically every episode if they are cops, and they say "no" every time!  Drug bust, prostitution etc... It don't matter! Just like having the money in an envelope don't matter. For them to build a better case, I would imagine they will try and get you to say/admit certain things. But lies? Like someone said above, they were trained to lie. Just mho  

...are you sure you're not a cop?

I have had one person sending me several emails about a provider... asking me if she is "wild" or is she YMMV, (??).. I asked him what he meant.. he said he wanted to know if her BBBJ was sloppy.. .. Huh? read her reviews or come out and ask me what do you mean...  I suspect that he wanted t know if she was into BBFS .. She's not.. luckily.. but really ?

The best are unknown guys who send the

Looking down on those that use a different forum to find their hookers. I bet you don't call them hookers either. As I've said many times here there are plenty of quality ladies on BP you just need to use it in conjunction with TER. What you suspect is ignorant.

When I first entered the hobby I was worried that it might be a set up, so I looked at every woman with a certain number of reviews or higher. Are police really going to set up a fake website for a woman, then somehow write 30 or more reviews? Nope, so I was sure that women with 30+ reviews would be legitimate. Also the reviews that even basic members can look at state if the photos are real. So scrolling through the review that can be seen will reveal if the photos are actually the provider. Though some might be a bit dated. So, anyone who would ask Are your pics real? is too lazy to scroll down the basic review. If they are looking at a woman with a lot of reviews, more than likely she is not a cop. Besides, if a service provider does ask for money before even going to check the bathroom, that is a sign to say, "sorry, maybe we should end the date."

do they think a girl would seriously come out and say they aren't her photos? Like..... no girl is going to post fake photos of herself and then tell you that they aren't her photos. Some people have zero common sense or brains...

His lips are moving.  -rimshot

There would never be any undercover busts if they couldn't lie.  
I can see it now. Undercover cop infiltrates the mafia, getting along well, getting lots of info, suddenly someone asks him, "Are you s cop?"  "Oh, Oh. You got me. I can't tell a lie. Yes I'm a cop. Can I leave now?

Lol

I bet you're the guy asking if she's a cop. Good luck getting the cops to admit to that! Or maybe... an experienced monger who can't find her reviews to see that the pics are legit. You just have to ask, right?