Hi, welcome to JA.
Here's my opinion, I work at a well established European repair facility. We have quite a few Saab owners. On every model we start to see fuel pump failures and ignition modules. Both fairly expensive repairs. Also, on convertibles, we see common 5th bow piston failures and all around top failures. If your top stops working, it'll be even more difficult to sell. Since Saab has gone out of busyness, we get some parts from GM, and one last part supplier who can get us Saab parts. I believe these cars are going to become rare soon, and with that the prices of repairs an parts will go up. I would strongly consider selling it now. 73k is low miles, but I start seeing these problems between 60k-80k.