If they don't want to charge more though?

When their gas prices go up, their equipment goes up, their feed goes up, etc, they won’t have any choice.

Doesn't quite answer the question (of why they should sell at the highest price they can).

Unless you are suggesting that raising prices today is better (normative sense, since you used the word "should") than raising prices when you don't have a choice. In which case, can you explain more your reasoning?

I wonder though, in specifically this instance, if the price of their feed is going down because of how many chickens have been culled or just flat out died from disease.

But yea, if other cost rise, they will need to rise prices.