> I'm just pointing out something fairly obivous - that not participating in a market is not a very effective way of changing how that market produces things.

Everyone participates in the market for buying food. There's probably someone out there who has the very narrow goal of changing how meat (and only meat) is produced, but for everyone else this is a strawman argument.

We want to change food production, and overpaying for similar products is obviously going to be less of a signal than larger dietary changes.