Same here. I have the iPhone 6s Plus and I have no reason to upgrade to a newer version. I do use mine a good bit, but it does everything I need it to do. Newer models would only offer me a bunch of "fluff" that I don't need.
We do seem to be the minority with our opinions. Everyone else is upgrading yearly as they succumb to the marketing hype and pressure put in place by society to have the new gadgets.