Not an expert, but I just can't see how "leaving the player on" will "affect the laser/lens". How many times a day are you powering it on and off? I agree with Montejay; powering it on and off will probably wear it more than leaving it on......
PS-don't forget, digital players can be somewhat prone to failure, & need repair. They are complicated components.
PS-don't forget, digital players can be somewhat prone to failure, & need repair. They are complicated components.