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I think it's beyond many people. A typical pattern is that you forget your bag at home and end up buying another one. After this happens a few times you now have an excess of reusable bags such that you will never recoup the "173 times" on all of them.

One solution for this is reusable bags with a deposit that you can give back at the supermarket in exchange for cash. We have this at some supermarkets in Germany.

So, you forgot your bag, now you just can't have another. This solves the problem of you having any bags.

You can have as many bags as you want, they’re just reusable and returnable.

I imagine part of what makes it difficult is that people can and do reuse plastic bags. If I reuse a plastic bag 20 times before it breaks then you now have to reuse your cotton bag 3460 times, which is much harder.

One argument for PET packaging bans is that there are people for whom the discipline of disposal is hard. If it's true, than re-using cotton bags for 173 times is hard - on average level, not for you personally.