It'a not a question of not wanting to upgrade, 'just because', Den, as I'm perfectly happy to upgrade my 8.1 laptop, but my Windows 7 machine is already at least 7 years old, and has a few programs on it that I don't think will run on later versions, as they only just manage to run on Windows 7! These are programs I am used to, and have features and functions that later versions don't have, so I am keen to keep them up and running for as long as possible.
Besides, I should be able to decide for myself whether I want to upgrade my own machine or not, and if I choose not to, I shouldn't be left with Microsoft nagware cluttering up my system tray. There should be an option to say 'No thanks', and the icon goes away. When I choose to upgrade, it will be to a new machine which will have Windows 10 (WX?) on it anyway.