Antique dealers and auctioneers are on the bottom of my list !! They are right along side the local car dealer !!
Gee Wiz! Mart & ghopper are on these people like a bad habit! My experience is different, most of the dealers/auctioneers i interact with are basically honest, perhaps because over the years i have weeded out the bad actors in the industry. That being said, with the kind of objects i collect, i do not believe what descriptions in catalogues say, not because they are dishonest , more like they lack knowledge and do not have the time to research. As for dealers, there are not that many in my field of interest, less than 100 i would guess that specialize in early furniture, most of them are very honest, at least the ones i deal with.
This makes the Keno dealio very distressing if it turns out they engaged in dishonest practices, they are dealers at the top of the market, masterpieces actually that sell for very large sums, add in the high profile of TV and man o man, this ain't good, at all.