Well, buying a new one came sooner than expected when the 5 year old accidentally punched the screen with a PS4 controller that she was unplugging from the charging cable.I bought a used 55" OLED (LG 55EC9300) real cheap because of some burn-in. Under normal viewing, it manifests as a yellow tint in the center of the screen, but it's not that bad. When running test patterns, there's a pretty clear SyFy logo among other artifacts.
The picture quality and contrast is still great and has me sure I'll buy another now that they have better controls around preventing burn-in.