I have a C8 and only use it for 3 things: Vero (Movies and TV eps), Basketball games, and Wii U.
I have not experienced any issues.
Obviously mixing up your content helps prevent image retention or burn in.
I was an early adopter of plasma and everyone was worried about that then too.
All I did was play games, watch movies, and the occasional basketball game.
After 10 years of use I had zero burn in.
The only thing I would fear is accidentally leaving your tv on over night with a static image.
I did that once with my plasma and it had image retention for about a day or so, but then it went away.
For my C8 I have the screen saver set to turn off my TV.
So if I fall asleep while watching something then the longest it sits on a static screen is a couple of minutes and then it shuts down.
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