A sincere and non-troll question - I'd be really interested in hearing from people who have a major use for speed reading. I'm finding it difficult to visualise

A sincere and non-troll question - I'd be really interested in hearing from people who have a major use for speed reading. I'm finding it difficult to visualise the material such readers are encountering - are they reading for pleasure or work? Presumably, if the former, reading speed is unrelated to enjoyment (in fact, a slight negative correlation), while, if the latter, isn't the time spent actually reading a vanishingly tiny portion of digestion? It takes me (and I'd imagine most people?) around 5 minutes to read a menu, for instance, of which time my estimate would be that around 5-10 seconds were spent actually reading the words. But this technology is clearly of great interest to people - what am I missing?