They harmed 2 people
There were people who really wanted that coin and were shut out because others hoarded them with back door methods to get extras.
Those who bought were offered less than market value because they didnt know that the coins were worth alot more than they were being sold. And it isnt like only a coin dealer could have sold them, Anyone could have gone on ebay and sold them. Took really no time out of my life to do so
Why is that worse than what you did? You also (if I read the last line correctly) bought it to sell for a profit. The one who sold to the dealer didn’t harm anyone any more than someone who sold directly on eBay.
There was also a benefit to sell to these dealers, because they guaranteed a profit, so there was less risk involved. Therefore, the dealer didn’t harm the one he bought it from.