There are areas where I will post on BP.
Kind in mind, TER is a review board first and foremost. You should not expect a lady to solely use this site as her advertisements means. Many men have not yet found their way to TER and certain demographic areas are not strongly represented here.
In my BP ads I indicate my TER ID so those in the know can find my reviews. Many times I will get responses from my BP ad containing all the verification information I need to begin screening...TER handle, whitelist if applicable. P411 ID, etc. I have asked many of these gents why they are contacting me via BP when I clearly have a weekly ad posted here. The response most often is " TER ads can only be posted once every 7 days and your plans may have changed, if I see you today on BP I am more certain you are actually where you are ".
Anybody I see that isn't already on TER, I tell them all about it. I saw a gent yesterday, after screening with work info, after talking to me on the phone he signed up for VIP so he could see all the juicy details.
Does BP get LE attention? Probably, but, probably not as much as you perceive. Monitored? Maybe from time to time...I don't think there is someone from a Federal agency sitting at a desk all day and alerting local PD across the US.
There is potential for any of what you imagine to be specific to BP on any of the ad sites. A lady shouldn't be expected to attain her business from solely P411 and TER ( one is a verification site, the other a review site )
You being a newbie, it should be her being more skeptical of you not vice versa.