I say if your happy with cheap glasses, keep it that way. Once I donned the expensive ones, I wouldn't be happy going back. Myself, I like Maui Jim's. The first pair is expensive, but you can send them in for repair and they have always sent me a brand new pair back for the repair price. But ya, you could probably buy a couple pair of cheap ones for the repair price. Also this is not helpful if you lose a pair. But knowing how much a new pair costs, I keep a close eye on my glasses.
Back to the thread subject, "someone" left my beer on the tailgate of my pickup truck when I was moving a few years back. It was still there when we arrived at the new house. Of course I was driving a bit more carefully.
