It's all up to the pond owner what they want to feed, and what they can afford to feed. I have been at a pond where the pond owner had 2# HBG, and only fed Aquamax 500. Toss in Aquamax 600 and they'd swim past it to get the 500. To fish that pond, you really had to "match the hatch" or you wouldn't catch very many fish.

If it was my pond, I am a bit more cold hearted than others, and I'd say either eat what I'm willing to throw out there, or starve. I don't have time to hand throw on a daily basis.