It's just the essence of the hobby.
The payoff is the thrill or the satisfaction we get from finishing and flying, not the worth of the final product
For that, we are suckers. We pay more for the components than the worth of the finished product, and if you start counting labor costs, it gets laughable
As I get older, I get more conservative and/or skilled, so I crash less and less badly and the models pile up over the years.
Seriously, I can only fly about 4-6 planes per year WELL, so the rest I try to keep the batteries cycled and worry what happens to balsa after a decade on the shelf
An Alternative Answer would be to fly in a riskier manner, the end effect being to reduce inventory faster, but that seems counter to my ego structure: I really HATE to crash
So I tend the museum, usually make a winter list of the planes I'd like to fly next summer