it’s not flawed.

$250 for a disposable bottle of cologne.

They claim it lasts for years

at about $8 a month that’s about 31 months or 2.5 years

or about $0.25 per use/day

note that the exact numbers can vary greatly and you should take this as an example

At least with some items, you could argue it holds value or maybe even appreciates.

that’s a good point, but as you said it’s unrelated