15k orders over 20 years is on average 2 per day or 750 per year. Is that a typo?
Even if I'd replace all my store visits (grocery store, hardware store, electronics store are the main ones) with online orders, I'd probably still not oder more than once every five days (or maybe once every 10 days during covid, now that I go to the grocery store less often).
Or are you talking individual items, like you buy groceries from Amazon and every item is a separate order because they all ship from different sellers?
I think this explains it. Cheapest ducktape on Amazon is like $3.48 with free shipping for Prime users. Ordering one such tape every other day only costs $52.20. At some point you stop caring how much externalities it might be causing by clicking "Order Now" in Tuesday 3:40 AM just for a single M4x20 screw you forgot to add earlier in the day.