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I've had that but I've also had the surprising inverse where a professor will publish their own textbook for the course as a cheaper alternative to the "standard" course textbook. That's always nice because it was more affordable and only really had the content the course needed

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I'm a math professor and while I get invited to those textbook publisher conference (free hotel, food, gift), I never volunteer to attend as I rather spend more time with my 4 year old daughter.I can tell you this, I hate those textbooks and our department tried several times to adapt free textbook (open sourced and those written by our own faculty but given to students for free or just printing cost).