From time to time I get phone calls, usually from Agents, asking if I can fill a booking at the last minute (sometimes even on the day). Usually it is because the drag act booked has either gone sick or has car problems (that excuse I take with a pinch of salt!). But sometimes it is because a drag act has pulled out of a booking. This I think is very unprofessional. If I accept a booking then, as far as I am concerned, it is written in stone.
Some acts seem to think it is OK to accept a booking and then, if a higher priced one comes in, dump the original booking and go where the money is. This is something I would never do.
If the money offered is too low then I wouldn't accept it. I would rather be sitting at home than working for less than I think I am worth. But I feel that once I have accepted the booking then I am morally obliged to see it through. If only all venues always felt the same!!