[CobrastanJorji]

Not necessarily. If the box costs 10 times as much, but they come up with a way to use the box 12 times, it was worth it.

That won't work if the recipient doesn't have a need to mail something back, but for a use case where you expected most boxes would be shipped back (maybe a phone repair company?), it could absolutely make sense.

[Dylan16807]

The post you're saying "not necessarily" to has nothing to do with the cost of the box itself. If returning it costs too much, the box could be free and you'd lose money.

[jcims]

Just make it up in volume! ;)