In my five airheads I have about $15,000. I have another $4000 in spare engines, tires, a transmission, parts, and special tools.
Just under $20K. My GSA was more than that new.
To get all my airheads in running order I will probably spend another $5K.
If I were to sell everything I would probably get about $16K. That's a net loss of $8K. I can live with that.