1) I run ads almost weekly. It's good (IMO) to maintain a presence.
2) I am a traveling lady. Usually in response to a request I will throw up an ad for a two night visit to their area. During those two nights I see no more than five (preferably four) gents.
3) I advertise on BP although typically only while touring but on occasion I will throw up a local ad to supplement. From that ad (a one week sponsor ad) I will commonly only accept on the average two new visitors.
As a rule my advertised hours are 9am-10pm but I only accept no more than two appts per day. Meaning, if I have seen two gents already by 7pm, I am done for the day.
That said, I consider myself low volume. I also recognize some may disagree as definitions vary. Some have said more than a few appts per week is high volume.