It baffles me why anyone would leave for a trip without first servicing their bike and making sure everything was in safe, reliable and working order. Would you do the same with your car on a family vacation? If you know you're going to need a regular service, call ahead and make an appointment.
Sure, "manure happens" and you need unexpected repairs. But gee, who's really to blame here? Riders show up wanting routine repairs done and feel they deserve to be put in front of someone with an emergency.
In my business, if you call me on a weekend and say, "I have no hot water. It's been luke warm for the past week and I thought it would fix itself. Can you come right over?" The reply you'll get is, 'Sorry, we're going for a motorcycle ride. I'll be there Monday morning.'
I like the sign I once saw:
Your lack of planning DOES NOT constitute an emergency for me.