I have heckled a few myself. Someone selling a shiny wheat penny from the '50s for $300. I send them a message that I'll sell them an entire roll of the same coin for $300. Wonder why I never hear back from them.
That's tame compared to some eBay listings. It's about 3x the average price. You need to get to 10x+ for an unremarkable coin before it becomes delusional.
That is just bad - this is delusional. First not 1883/2, second not xf to au. I just gotta laugh at some of auctions. I see these filled 2's all the time as 83/2. I used to try to tell the sellers - but gave up over time.
I collect militaria as well and I have seen some ridiculous stuff on ebay. Like an extremely rusty helmet being sold as "rare". News flash, they made tens of millions of them so it was definitely not rare. And in the condition it was in it was practically worthless.