ebay will tell us how interesting on Sunday March 3, when the auction closes. (I'm running it between Feb. 21 and March 3 to maximize the exposure.)
To me, it's worth spot, but I'm often surprised at the prices fetched by some rounds.
I've gotten quite a range of results when I've tried to tone silver coins, using hard boiled eggs as the source of sulfur. The worst is when it just looks like some blotchy coffee stains.