Last week I was watching a TV programme which served up a  valuable business lesson.   Here's what happened.  Three B & B owners stay at each others places for a night.  In the morning, they can decide how much of the standard tariff they think the experience was worth.  They also provide comment on what they liked or didn't like.   Participants were a young couple just starting out, a posh lady who used to run a finishing school, and a down-home older couple.