"Honestly if there is no chance that I ever buy something (say because it is not available for sale) what does it matter if I download it?"
Devil's advocate: You spend time consuming the thing you torrented instead of buying something that was legally available to you and consuming that instead. But yes, this is getting to "penumbric emanation"-level of arguing, though I think that the limited nature of your time is something that should be pointed out.
Likewise: If the thing that isn't legally available to you is "the best use of your limited time," then you should accept no substitute and acquire it anyway, as otherwise your limited time is being wasted. No?
Devil's advocate: You spend time consuming the thing you torrented instead of buying something that was legally available to you and consuming that instead. But yes, this is getting to "penumbric emanation"-level of arguing, though I think that the limited nature of your time is something that should be pointed out.