There is no gambling involved in buying a book. I give you $X you give me a book. Gambling is I give you $X I have a,b,c % chance of getting A,B,C. Usually I g

There is no gambling involved in buying a book. I give you $X you give me a book. Gambling is I give you $X I have a,b,c % chance of getting A,B,C. Usually I get nothing. Nothing I can do can effect the outcome. Colloquially, you might say "I don't like this author, but the reviews say blah was a blah, so I took a gamble". But that is clearly not the same as pure chance gambling.