Just speaking for myself, its easier to define high volume as the provider is who advertises without stating only certain days with limited hours of the day when available. Its the provider who runs ads just about every week and while not necessarily being available 24/7 is open for business more often than not. I would say that low volume is the provider who has the intention and/or need to see only 1-3 clients a day and/or is only available a few days a week. Its all relative. I have known providers who see only 1 or 2 a week and are very UTR and on the other end of the spectrum those who are literally 24/7 types. The traveling ladies are definitely high-volume - at least while on tour. Those who are popular will be busy from 8 am till midnight. I think its safe to say that most of the ladies who advertise on Backpage are probably high volume and those with pimps are extremely high volume.