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I used to see a lot of burn in back when monochrome computer monitors and text based systems were still common. Often the burn would be sharp enough to read the text that had burnt in, usually a login prompt or menu. I've seen monochrome plasma displays with screen burn. Most text based systems have no provision for any kind of screensaver.
Most of the burnt in color monitors I've seen have been embedded displays in gaming machines, ATMs or connected to PCs that are basically unattended (server consoles, etc). A color CRT usually doens't spend enough time on the average users desk to burn in.
I've got a couple of 20 year old Trinitron video monitors that have time code numbers burnt in. They still produce a bright picture with good focus, the burn in isn't really noticable unless you specifically look for it.
On the other hand the other day I say a recent Sony WEGA flat CRT with severe burn in and almost no green. It had only lasted a couple of years as a surveilance monitor. The burn was so sharp you could make out the layout of the store in the shadows on the blue screen.
Screen burn used to be a good thing for those of us who had no money back in the day. I used a burnt 17" PC monitor for a while that cost me $40 when a similar monitors usually sold for $300+. A friend bought a screenburnt 21" TV for $25 when similar sets sold for $200.
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