I hope this is allowed but this has been my experience consigning for the first time. Basically, I’ve been hand listing all of his cards on eBay (it’s a fairly nice collection) but from the start he has overvalued everything to laughable amounts. When I started selling some and he questioned why they only sold for x amount I told him again that his prices are unrealistic and gave him sold examples of recent sales etc. I explained to him the difference between graded and ungraded prices (which is super important, especially for vintage) and he seemed to accept that part so I thought it was good. Weeks later he’s now complaining that I haven’t sold enough of his cards recently but its more that everything is up and listed and I’m waiting for buyers and that I’d be happy to go back and change all 1100 active listings to auction but that he’d get way less. basically, this dude overvalued everything from the start but I thought I had soothed things over enough. I’ve been selling/reselling/selling sports cards etc for 4 years now. He said he’d gladly take them back off my hands and sell them to an LCS(Local card shop) but then he would get absolutely gutted by a lowball offer but Ik starting to think that that’s the only thing that helps him see what his collection is truly worth (and the not 100k+ he thought) any advice would be super helpful, he’s started to be very condescending and rude over text and I’m being polite as possible while also trying to explain what these are worth ( again I didn’t blindly post these things either, I hand listed them and priced them on the average few sales (with the exception of nicer condition big name players being put to auction to fetch a bit more) any advice is greatly appreciated! (I’ve netted 3000 for him in total so far which is about 1/3rd of the cards) and gotten my own % too.