Is This A Violation Of Any Ebay Rules?

Cherry picking at all levels is absolutely fair game .
Being dishonest is not and we all have to be aware of
our own moral compass.
Having dealt coins for a very very long time you
quickly find that knowledge is power and if employed
honestly can make you a lot of money .
A quick story , the late RC Willey ( Haxby Willey catalogue ) was a
frequent customer of mine when I owned Pacific Coin Centre Ltd.
in Victoria BC . He would help me on some tricky ancients and I would
give him first shot if anything excited him . We became friends quickly
and he was always welcome . To all who knew him , he was highly
intelligent and very knowledgeable.
One day after one of my overseas buying trips he came to see me
and wanted to look through junk boxes . I had 3 , 5 and 10 dollar
boxes . Anything I tossed in them was fair game as it was MY duty
to figure it all out .
He found a Colonial token in the 10 Dollar box , which after his research
turned out to be worth around a thousand dollars . He told me all about
his great and fortunate find a few months later .
About a year later Bob died and I was honoured to be the one who sold
his rather extensive collection .
I still smile when I think about the incident and the later result .
When a knowledgeable collector " Cherry picks" a dealer it is fair game as
far as I am concerned . When a dealer lies to a collector about what they have
totally dishonest .

@Bosox. I agree with you. I remember when I own a cafeteria in an big Montreal hospital. I was there (good for the lady). The cashier come to see me and show me, I remember an sovereign 1917C and ask if it is legal coin. I was to see the lady. The bill was around 12$ and her was there with the husband on the last days and two days before her pension enter in the bank. I return the coins telling what it is and give a permanent voucher of 25$ to use any day any time. I think this is to be fair on business.

I bayed many coins or paper money of the price was ask, even was ridiculous down. I was just asking if the price ask it is what really he want, and then I payed. Manny was from dealers which to day are in my friends circle.