Froide and GeoffR raise excellent points. I'd also add that if I could read faster I could fit more hours of sleep in the day. Plus, at the risk of sounding like I have some bias or alternative agenda
, I'd also suggest that there is a huge amount of material now available for free or much lower cost from independent publishers (not all of it is crap, and if you can read faster you can review and discard faster), as well as more old material falling into the public domain every year, so running short of reading based on cost doesn't seem a huge problem.