Nnelg wrote:IIRC Jillian had a purse as a barbarian; however it was very small.
Correct, Purses and Treasuries are very different things. A Purse is limited in maximum size, and as I understand, only pays upkeep for units the commander is stacked with.
A treasury is like a bank account for the entire side, that collects income from every city and pays upkeep for all units no matter where they are.
EDIT: Purses have the advantage of being much prettier, if a good Dollamancer is involved in their creation :p