Bilbo´s treachery

[Inziladun]

Originally Posted by Faramir Jones

One could argue that Bilbo has already taken and disposed of his fourteenth share, in the shape of the Arkenstone; but that he still felt he was owed something for dealing with the 'two messes'.

The main issue with that interpretation is that Bilbo didn't want to take any of the treasure; he apparently just settled for the "two small chests, one filled with silver, and the other with gold" out of politeness to Dáin. I do wonder though if his failure to include any jewels there might not have been an after-affect of his dealings with the Arkenstone.