Well yes and no. Spending money on something, especially when you’re short on money, makes you value it more and overall for me this would make it more likely to actually go through that book. But that’s me.
For me it's totally irrelevant how many money I spent in how much I value something. I have numerous overpriced textbook in my shelf that I've never read, on the other end my libgen textbook are used constantly and got me through university.