It's not worth the effort producing quality butter, presumably, as the marketeers see it (1,3,3,2,4) (1,3,3,2,4)

'it's not worth the effort' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'quality butter presumably as the marketeers see it 13324' is the wordplay.
I cannot really see how this works, but
'quality' could be 'good' (good is a kind of quality) and 'good' is found within the answer.
'see' could be 'lo' ('lo' is an archaic exclamation meaning 'look!') and 'lo' is found in the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

'producing' is the link.

Can you help me to learn more?