Exactly, an I think that's especially true for BP. It's one of the reasons I'll never change my phone number or booking email. We know fake ads happen often, and it's largely on BP as it's not verifying the provider. So if you see a provider always using the same contact info, you can be pretty certain that ad is legit.
On BO, I go a bit further than that. I have a couple different ad bodies that I use depending on location (some cities one text will work and another won't), however, my ad header is always the same. It has something about me being there or just pre-screening, followed by a standard header text, and then visiting dates. If you google one of my ads, you can see what I'm talking about. If it fails to look like that, it's a fake, if it doesn't have my WI phone number., it's a fake. I think consistency goes a long way toward legitimacy. When someone has a reasonable expectation of how a providers ad looks, on any service, and they see one that doesn't fit into that, it's a pretty good indicator of bullshit.
Any of us that take time to test different layouts and ad bodies are more than likely to stick with that because of the investment in it.
When you guys are reporting all that stuff to us, that works better for you because 1)we can let you know if it is legit 2)helps us get bad crap off the net to give you guys more assurance what you're seeing is what you'll get.