Do you think the lifespan of the topic or the delivery platform impacted your returns? I don't buy a lot of books anymore but used to drop 40-50 bucks on an O'R

Do you think the lifespan of the topic or the delivery platform impacted your returns? I don't buy a lot of books anymore but used to drop 40-50 bucks on an O'Reilly book that would be used for years. My LP purchases probably top out under $10 and are for more immediate, short-lived topics (which seems to be what the platform targets with it's digital & updated content focus)