I love all the authors mentioned here. I also liked to read Silverberg while eating big Macs, with the Windows open.
Seriously, Ringworld and Lazerus Long are my all timers.
More seriously, and here is where the 'profit' part of my subject line comes in, I am SURE that we have to rest our minds for some certain amount of time each day or our 'efficiency' or 'capacity for work' drops. Finding that out gave me the right, and duty, to read for pleasure each day. It is like finding money you didn't know you have.
But what happened to 'hard'sci-fi? Some stuff these days is Wierd with a capital W!