Do I think they make sense? Of course they do. But there wasn't any option for "No, I don't own any nor do I have plans on getting any". We were sort of forced to choose the option that had an addition that they don't make sense.
They make perfect sense for the corporate world and also warehouses/factories. Netbooks are very light, will fit easily in a purse or briefcase and give you not only the ability to browse the web properly (can't say the same for most smartphones) but also store documents and edit them on the fly. They have video outputs for connecting to a projector for PowerPoint presentations. USB ports allow easy document transfers between workstations with a USB flash drive. They last like 8 hours on battery too.
Nettops are perfect for a warehouse/factory. Instead of using high power desktops that are difficult to place, cost more and are harder to maintain you can use a cheaper, low power nettop for your basic text based telnet applications or RDP functions at a factory. Given that most nettops don't have fans you don't have to worry about too much maintenance either. They have been used for years as thin clients anyway.
I would recommend nettops for office use as well but I know just how much people would complain about the speed.