You chose to buy it at that price. What does it matter what the original price was or how much the seller made? You thought the price was fair, had the choice to not buy it or buy it somewhere else.
This isn’t like scalpers buying up items, creating artificial scarcity and driving up prices for profit. This is just plain old capitalism.
Presumably the price also included shipping and handling fees, since you bought it online. So in the end the seller probably made just a couple of quid, he deserves to get paid for what he does no?
Ok, don’t buy it online then go get it from the thrift store yourself. Oh that takes valuable time and effort? Guess that’s why it was marked up, peoples’ time is worth money.
Because I live in another country, a non English speaking one, so there’s zero chance that thud book will make it to my country thrift store
My case rests, the seller of the book provided you a valuable service then by making a product available to you that you otherwise wouldn’t be able to get, and you’re mad that they made a little money for their time?