If everyone who liked the original goes out and buys a remaster, then hates it, aren't they still counted as a sale? It's like a movie ticket, you don't know if the movie will be any good when you pay for it. I don't see sales numbers as being linked to quality or enjoyment.
Why would anyone do that? I would assume people can just read a review first before buying. Especially since they already played the original, so it isn’t like they would need to worry about spoiling the story for themselves.
Also, easy Steam refunds if the game was played for under 2 hours is a thing.