Rusty you hit a major conundrum smack between the eyes in your second sentence. That is, handling customers that arrive at line up to learn bumps and you can tell by just looking at how they stand on their skis, that bumps ain't in their near future and that $25 or so they just spent should be directed to the goals of your sentence.
I'm lucky in that we have to travel to get to the bumps so we have time to try some quick fixes. If that does not work and the guest still wants to get their butt kicked, I have a few cheat tricks that can aid survival and our nasty bump run always has an escape route. I take more students to terrain over their heads than many top notch instructors because I have a silly belief that I can manage the risk (which is hard work), I've yet to get burned for doing this and I keep getting good results. The conundrum starts to disappear when you can see these students as opportunities instead of challenges. My goal is to get to "wow" in every lesson (note - this is a stretch goal). It helps if you believe that there's always a "wow" out there to be had. A wow does not have to require delivering on unrealistic expectations. I've been known to tap into my evil side to get results when facing unrealistic expectations.