Just leave your screen the way you like it.
I leave my plasma tv on the settings that make my eyes happy even though it might "burn out" faster. So what? I use Apple computers, Panasonic plasma tv, and Canon HD video cameras.
All are quality products. I'm not worried. By the time I "use it up" enough to buy a new one,
1. there will be something better
2. if not better, the same item will be much, much cheaper
3. I already got my money's worth out of the item using it the way I wanted to
If I owned a Ferrari, I'd drive it everyday if I wanted to. My friend bought a Ferrari 348 years ago and kept it in his garage for "special occasions". He later sold it for a loss and the only thing he regretted was not driving it more often (given how much he paid for insurance).
You bought it, use it the way you want to!