It's probably going to sound like a very stupid question once someone explains the answer, but I do wonder...
Why do we charge more for outcalls?
Incalls, unless we want to work from home (and I guess many don't have that luxury) we have to rent the place (by the day/hour/week/whatever), keep it clean, which is a higher expense than public transport to a client's (I'm assuming that taxi rates at *really* unsociable hours would go on top of the outcall rate)
Outcalls, on the other hand, you go to the guy's place/hotel and do the deed. I guess it may start to make sense once you factor in travel time, but that only really begins to matter if you are getting a certain number of clients in a day.
Is there something else I haven't considered?