With the unfortunate consequence of placing piano teachers, public presenters, and child-eating witches in the same metaphorical space, I think my feelings about the easy/hard dilemma also bear a "Hansel&Gretel" interpretation.
The witch in the story does not go out looking for children to eat. Instead, she waits patiently, and when the children present a sufficient combination of desperation and curiousity, she encourages them to come closer by tempting them with something they already want. In this context, of course, it's all very lurid, but in abstraction this is how people connect with each other: we have needs and curiosities which, under the right circumstances, lead us to lower our defenses and attend a lecture, try a new piece, and so forth. The art of the teacher is to sense those moments when our students are ready for something new, which new thing they're ready for, how much they can take in, and when to let them return to more comfortable terrain (this last is, perhaps, what differentiates us from fairy-tale witches). In the meantime our engagement in and love for our chosen fields is what others see as our house of candy (if you'll pardon the...um, saccharine...analogy).
This all reminds me of my first piano teacher, who gave us M&Ms after our lessons. Do you suppose she was trying to fatten us up?