Oh, trust me; those orchards are a cash cow. There's practically no amount of fruit you could have taken which would have caused them material damage. Most of them don't even make most of their money from the fruit; they'll usually have little shops, or processed fruit goods (jams, syrups), or food, or hay rides as well. There's one near me that does the fruit-stuff during the summer, then converts into a haunted farm-type attraction in the fall, and the owner says they make a ton more money in the fall season. The "pick your own fruit" is just to get people in the door, and they usually overcharge like crazy for the bags under the assumption that their customers (A) are gonna take a ton, and (B) will end up buying some other stuff on-site.