That's fair if we only strictly care about the Billy line and it's history.

From there we can't generalize to any other product without acknowledging IKEA's internal decision process or their vision for Billy across the years.

To parent's point

> where the inflection point is where used items become more valuable than the new items being made at current quality levels, including degradation due to age.

Buying the actual modern equivalent of what Billy was 25 years ago answers that question.