Reading for entertainment is great! But if you're working in the startup world and your fun reading is all about startups, you should probably broaden your horizons a bit, if only to avoid becoming a bottomlessly tedious person. Go read some fiction, or some non-fiction in a field that has nothing to do with your work.
Who are you to say what people should enjoy doing in their free time? You know what's bottomlessly tedious? Doing things you wouldn't normally do simply to appear more interesting to people who don't get you.