Interesting observations, and a logical conclusion about generosity vis-à-vis badly needed and jealously guarded advantage. I will need to ponder them at greater length to figure out how to reconcile it with my own observations in two jobs I held (1, 2) that involved bidirectional class-divergent interaction: I found that privileged rich upper class individuals tended to be niggardly, and underprivileged poor lower class individuals tended to be generous. But this was in terms of material goods and money, not recipes or other knowledge.