I thought the same thing. I love avacodos, but I've given up purchasing them because I'm so bad at finding the millisecond they are ready to eat before they turn to mush.
I've started buying them when they're very hard (Costco sells them by the bag) and then waiting for them to ripen at home. This keeps them from getting bruised by other shoppers. So far, I've had good luck with them being ripe and good for about 3 days.
Yes, this is absolutely the secret to awesome avocados. Buy the unripe ones--the ones shoppers aren't squeezing to death--and let them ripen over a few days. Then, a few days before you run out, go grab the next batch.
I visited an orchard a couple of years ago. The owner stored his pears at 0 degrees celsius and apples a little bit warmer - 4 degrees celcius if I'm not mistaken.
Since that day I've put my apples and pears in the refridgerator, and haven't had to suffer as many overripe pears and apples.