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?
Oh, yes let's let perfection be the enemy of good.
It's a rare thing I can't get from my Library (mostly music and some movies), but anything educational and it's there.
I regularly check out DVD collections from The Teaching Company of university courses - I'm talking Harvard, Columbia, etc. Currently have History of Western Civilization on deck for ripping. It's 40 hours of lectures, the DVD collection would cost $1500 on the open market.
It's one of dozens I've ripped for my own use, and converted to MP3 to listen when at gym or in the car.
Do your libraries not have a system to request books from other libraries? Not trying to be a jerk, I just have looked for some obscure things before and sometimes they had to be requested from other libraries.
https://search.worldcat.org/ is a good inter-library search site. My librarians use it (among other things, I'm sure) to find books/DVDs to acquire for me on ILL, but since the site is public sometimes I just do the search for them and send them a link to what I want when I submit a hold request.
Everytime i have been unable to find a book in the library i have asked the librarian and had it brough in from another library. i dont think there has ever been a book i wanted they didnt have somewhere in the chain