There are some T5 Romulan Rep vanity consumable items that use it as an input, in addition to the trophies/ holoemitters available from Quark's and the inputs for the DOFF system.
I don't really have a need for consumables and the holoemitters don't last long eough to justify the cost. 15 minutes for the holoemitters needs to be changed to something more fun. Try 24 hours, then I'll have an interest. DOff missions are more of a sink for Latinum and rarely ever provide yields that make those DOff missions worth it.