Hi Peachy,
I accidentally voted I will only see escorts that provide cbj when I meant to vote I will never see an escort that doesn't provide bbbj but that's not exactly right either.
When I choose an SP, I will almost never pick one that doesn't advertise bbbj unless her pictures are perfectly my type and realistic. However, when the time comes, whether the bbbj happens and how long it is depends on the flow of the session.
The story is different if I got to know my girl first (possibly through another, related context like as an MPA or dancer maybe). If I know that she doesn't want to get that intimate but I like her enough regardless then that's fine. I guess the difference is in the second case I already know I will enjoy myself.
Apart from safety, I have a theory that covered bjs require slightly different technique. I think I've only ever had one or two covered bjs in my life that I would have rated as excellent, so either most girls I've seen haven't been very good at it, or else the ones I liked when covered would have made me pass out if it was bareback.
So as applied to your case, if I was an existing regular, I'd probably be OK if you switched to cbj only. But as a new customer, I would likely not ring up after seeing an all-safe ad.