There's a TV program here on PBS, where 3 professional antique dealers are each given a limited amount of money and time to attend a flea market / show and find the best items to make profit on. After the haggling and buying is over, the items go to auction to determine who had the best or worst eye.
On one episode, one of the dealers bought a wooden chamber / toilet similar to yours. When it came time for the auctioneer to pass judgment...he wouldn't even put it up for sale, merely stating that had NO value.
(Yes...I used to buy them, and actually sell them at times, so that snooty auctioneer doesn't know everything.)