Orren's talking past her somewhat. Mira hasn't experienced much in the way of greed like that he's referring to. If a Cadian hoards things, even an upper class Cadian, it's likely to be weapons, rations, and medical supplies, which are entirely pragmatic things to have a lot of, as far as she's concerned.

"I suppose if it's an irreplaceable relic, it makes sense to guard zealously, but if it's just something you commissioned from an artisan or the like, if gets lost or damaged, you can just get another one." Mira shrugs. "The nobility care about status and power--the loss of possessions only matters in the sense that it's a loss of face."