Why not?
Jaguarenterprises can probably fill in the details, but I believe that the winner signs a contract agreeing that the Oscar can never be sold. It can be returned to the Academy (and some of them have been) but it can never be exchanged for monetary value. I believe it can be given away (how likely is that?), bequeathed to an heir (happens all the time), but auctioned for sale? No.
There were a couple Oscars floating around that predate the “no sale” rule and those were occasionally sold; the last time one of them came up for sale at auction, Stephen Spielberg bought it for a cool million and then immediately donated it back to the Academy.
I can't see a Sandow selling for more than $10K and even them I'm not sure who would buy it. Schmoes will pay for fle$h not a trophy.