Half the comment is correct:

So long as consumers keep buying this product primarily to get the cheapest possible fair then they are going to get cheap service.

Still, an airline seeking to maximize its profit by cutting fundamental corners (such as keeping the temperature on a plan fit for human survival!) is just committing fraud. By your logic, if the temperature reached 150 degrees and everyone on board was dead an hour later, you'd just say "well, they should have made different choices!"