This sentence intrigues me. Were you working for a specific charitable organization or were you out there trying to sell one of the cardinal virtues as an abstract concept?
> in most cases you're actually selling 'having an attractive person be very friendly to me for a while.'
This is true, and it has been rediscovered over and over again in many industries in many ways. Some industries are really that and nothing else, and they have long, honored, and storied traditions in some cultures (so denigrating them means you're an ethnocentric swine, in case you missed my hint).
One week you'd try to get people to donate to a child cancer charity and the next to WWF and the sales company would get the first few months to half a year of that person's donations.
Already in that first day one of the less attractive, but probably more skilled, co-workers told me that in most cases you're actually selling 'having an attractive person be very friendly to me for a while.'