: It stops at the point where production costs leave NOTHING for profit.
: No matter what ANY CUSTOMER thinks.
What does that tell you? According to you the candy bar still has 'value' because it has been given unto it by labor - according to those customers who would buy it at below costs but not above its exchange value is less than the sum of the exchange values of the inputs.
Hence LTV says nothing consistent about why and how people value things in trade.