Is it normal to collect twist ties?

Quite a few years ago, the local supermarkets put coin slot locks on their shopping carts, so you had to return the cart to the corral to retrieve your 25 cent coin.
Then, someone figured out that bread closure thingies would fit the coin slots and release the carts.
That was beginning of the end of coin slot carts.
I keep about 100 of various sizes just in case. I do find a use for them every now and then.

We've got a drawer with about twenty in there. We use them all the time to keep electric cords neat, attach the wifi radio/antenna to the topping lift, wrap around each country's courtesy flag to keep them neat and around any coil of small stuff or wire we want neatly stowed.

Depends on what you do with your "collection".