From what I've read of the Celtic aristocracy, ostentation and conspicuous consumption were pretty much their defining traits in terms of social status. But of course it just wasn't for show; they redistributed some of the wealth to their retainers, who were then indebted to the aristocrats.
The Romans had similar practices. Conservatives in the early-mid Republic may have found ostentation to be degrading, but the noveau rich of the empire held no such qualms. They took the client-patron basis of Roman society to its logical conclusions.
Should we malign the availability of goods and services, which some people pejoratively term