On Tue, 13 Mar 2018 05:28:09 -0700 (PDT), wrote:

I don't get it. How do clubs leverage selling older two seaters for a good price to fund new ones if everyone is doing it? If everyone is on the upgrade path who would pay a high price for ASK-13 to allow the purchase of ASK-21? And where are they now, are there low budget Euro clubs using old stuff?

Key factor is to sell the older glider early as long as it's still
valuable and the successor still halfways cheap. The difference gets
bigger the longer ypou wait to sell the older glider.

There are still many clubs in Europe that are using older trainers
like ASK-13 or Puchacz, nearly all of them from the former Eastern
Block where private gliding clubs could only start after 1990.