Yes, you can add a reasonable charge to the cost of a postage stamp.
it seems Ebay can do whatever they want, it was recently added to there policy. Personally I think it is wrong but just more of a write off for me.
postage fo 6.3 oz legal envelope
ExtraditionAdded: And having an additional criminal charge of "fugitive" added to the original offense.
No - only coins and notes of the realm are legal tender.
1 ounce
The laws regarding this vary from country to country. In general, it is legal to paint a picture of a postage stamp. Typically it must vary significantly in size from the original.
No, they are not considered legal tender. If someone is willing to accept them, there is no problem with it, but they do not have to accept them.
Exclusive ownership of raw materials a legal barrier to entry
Depends on the definition of Duck stamps.If you are referring to the stamps typically bought to be affixed to a hunting license to allow one to hunt ducks, no, they are not legal for postage.If you are referring to the US Postage Stamps that have pictures of ducks on them, yes, they can still be used for their face value toward the cost of postage.
The charge is defacing currency.
It is BUT the machines that read the stamps might show it as being cancelled and it could be returned to sender or be presented as postage due.
It may have value if you can find someone to buy it from you. A postage stamp has value, but not anything that you can demand. You can't hand one to a clerk in a store and they have to take it.