If you support the local economy, you support the people strategically helpful to like you, and aide you. If you do this naievely you will probably entrench systematic corrupt, biassed outcomes which will not outlast you, and will build opposition to you and ultimately defeat the purpose of being there in the first place.

Aside from that, the GAO is going to come looking for your audit trail so just like in those Heinlein novellas you loved as a kid, don't take over the other ranks drinks fund without a full reconciliation of how the money was spent because once you hold the books, it's your problem.