I think it depends on your target demographic
My incall is in Surrey, and I find it to be a fantastic location. Surrey IS central to the lower mainland - and it is very easy for gentlemen to visit from Langley, Abbotsford, Chilliwack, White Rock, Burnaby, Vancouver etc.
I'm fortunate in that my incall is right next to the skytrain, and there is plenty of parking if a gent chooses to drive - so it really isn't a deterrant for gentlemen to visit from downtown. It also has the added advantage of being much more palatable for gentlemen who are coming up from Seattle to visit with me.
I suppose it depends on who you are trying to attract. If you provide an real experience, and attract the type of gentleman who is looking for that, then your location isn't of too much concern. He will drive an hour to meet with you, and have no issues doing that.
On the other hand, if you are the type of lady who has a revolving door of gentlemen just looking to get off, then I definatley think that you would do better in a location that was more population dense. I imagine that the men who are just looking for a quick release as opposed to a real connection with a lady want something very close, quick and last minute.