Fine. I’m rough on sunglasses. I drop them, lose them and leave them on the edge of the kitchen counter, allowing cats to do gravity experiments on them.
My go-to plan for sunglasses has always been to simply keep a couple of cheap pairs lying around. My husband, who has had the same unharmed expensive sunglasses for more than five years, encouraged me to buy a nicer pair last year. Meaning a pair that cost more than (gasp) $30.
True to form, I dropped them, lost them and left them on the edge of the counter.
Some things you accept about yourself. Me, I’ve accepted that I go through a couple of $10 shades from Target every year. Really, there are worse personality traits.
Entirely Adequate 
I share your sunglass abuse as a trait. Sigh. I feel for you. It is a total waste of money to put anything over $30 on my face. I’ve even damaged them while they were on top of my head – a supposed “safe” zone. At least we have publicly admitted it. Way to go Suzanne!
My wife suffers from this as well. She recently went on a 3 day excursion doing genealogy research. I got a text from her at one of her stops that she had misplaced her favorite pair before leaving the house for her trip, gave up on picked up another cheap pair on the way up.
I found her pair later that evening on a shelf in the pantry. Apparently this was her hiding place to keep them safe as she lost the cheap pair in a cemetery while snapping photos of tombstones.
While I am the proud owner of a nice pair of shades given to me around ’95 or so. I lost a scuba mask off the top of my head in the middle of the local quarry while diving. That was embarrassing and mildly expensive. Also put an end to that scuba dive.