Murphy's Law Of Buying In Bulk
"You can keep purchasing small costlier-per-piece packages of a product till Doomsday, and you will always continue needing a sizable amount/quantity of it per week/month/year. But then just as soon as you plunk down a tidy sum for an economy-priced bulk-quantity of said commodity, your needs and/or lifestyle will immediately change, and so now you will likely never even begin to consume that much volume in your entire lifetime."
For example, you purchase several cases of plain white paraffin candles for your antique chandelier that you love to illuminate every evening, only to then discover that an electric-candle "upgrade" kit is available, and comes with fixtures that look just like the elegant candles and fit perfectly into your chandelier's holders! So now you're stuck with many hundreds of little white-wax tapers that you'll probably never have any use for.
For example, you purchase several cases of plain white paraffin candles for your antique chandelier that you love to illuminate every evening, only to then discover that an electric-candle "upgrade" kit is available, and comes with fixtures that look just like the elegant candles and fit perfectly into your chandelier's holders! So now you're stuck with many hundreds of little white-wax tapers that you'll probably never have any use for.
I feel like such a total bulk-buying buffoon --- I had been consuming several expensive plywood-cutting circular-saw blades per year in my household woodworking-tasks, and so eventually I had purchased a bargain-priced fifty-pack of only-minutely-rusty "new old stock" Skilsaw-blades from a private seller on E-Bay. But then I had started using a larger-bladed table-saw for most of my panel-slicing/trimming needs, and so I've only used one or two of the circular-saw blades from the package in the many months since that time! Sounds like a classic case of "Murphy's Law Of Buying In Bulk" to me!!!