[weinzierl]

I doubt the money generated from sales of valuable crap will cover the cost of your expenses.

The problem is that there is no such thing as "valuable crap". But let's assume people won't send you crap but only boxes they consider themselves worth more than $10. You will have a hard time find a buyer that pays $10 . In reality it's more like "one man’s treasure is every one else's crap"

The scientific explanation is Endowment effect.

http://en.wikipedia.org/wiki/Endowment_effect