Well, you know, I think about it like this....
Playing a cd in a computer is a pretty easy task. Be it in the burner drive, DVD drive or plain old CDrom. The player in your car, now it has a hard life. 140 degree heat sitting in the parking lot all summer, 0 degree days in the winter, vibrations, dust, and it's expected to work day after day without "wearing out".
And most do.
At the same time, all electronics suffer this "it just died for no reason" fate. Now, is this more likely if it's used constantly? Probably. But what's wearing out on a CD drive (genericly speaking), the drive rails? Some Ricoh units had a lubrication problem - one where constant use was probably no worse than letting it sit a lot because of the lube drying. The platter motor? Yeah, it can happen, but not very likely - think back to the car. The laser? True, it can burn out, but more likely it'll quit working because of dust in a little recess you can't get clean than anything.
I gave up on the 'saving the burner' idea years ago after one I babied died anyway. And it's replacement died in a week. The most recent one I use for burning and reading daily and works like new. Guess you have my vote.
--Mc