There should be a way to give people your ancient coins/doubloons, or gift them to people.
Gifting coins
You used to be able to read some of the support request posts on xbox.com's forums.
Sooooo many kids getting scammed for items in games and their parents desperately trying to get the money back.
90% sure this is why they don't allow it.
Buy someone a bundle or get them an Xbox gift card code if you want them to get AC as a gift...
2 out of 4