In theory a Calculus textbook could be an artifact to be treasured and loved. Durable and simple, filled with a refined and teaching tested version of some of the most important ideas in math. A book you'd keep forever. Were textbooks like that I'd not feel bad about asking students to empty their pockets to buy them.
But, the modern textbooks are objects made with contempt. Large and heavy so you know you bought something. Full of junk cluttering up the good parts.