I have 6 pairs on the go at the moment, of which 2 pairs are unused, one pair too small but still used, 1 pair dead but still used, one pair used occasionally, one pair used only as shoes for driving or walking (entry level running shoes but really not suitable for serious running). I have another pair of old ones in the car, in case of emergencies. In a bag of things to take to the charity shops there are at least 4 pairs of completely unusable worn out running shoes.
I bought a pair of very nice Saucony trail shoes from giggle and I knew I was pushing it cos they were half a size too small but they were such bargains. They were unwearable as they were too small and I couldn't even wear them for walking to the shops and having tried that I couldn't send them back. They were lovely but useless. What a waste of money. I had only worn them three times.
The next time i saw my mum, I took them with me. She was about to go on holiday and likes walking. They fitted her perfectly despite being half size too big, and she was delighted with them. Said they were the best ever for walking.