Personally, I'd rather read a 175-page novel, as a 175-page novel, than read a 175-page novel that had been stretched to 375 pages.
I agree, but, sadly, I still remember eavesdropping on a conversation between two customers at a bookstore.
Customer #1 picks up Book: "Ooh, a new book by Favorite Author!"
Customer #2 regards Book dubiously: "Kinda skinny, isn't it?"
Customer #1 reads back cover copy (which, ahem, I had written). "I dunno. Sounds pretty cool."
Costumer #2, still dubious. "Pretty short, though."
Customer #1 shrugs, puts down Book, and walks away, as I look on in dismay.
Alas, in the end, that slim, tightly-written volume didn't sell very well -- or so I recall.