A century ago luxury was available only to the privileged few, namely aristocrats, royalty and the very wealthy.
The very definition of luxury was used to describe goods that were rare, produced in small quantities and made by methods that had been honed and perfected over time. Think of Vacheron Constantin, the world's oldest watch manufacturer - they have been making watches since 1755 - that's before American independence, certainly long enough to make sure a watch is well made!
Today a Prada handbag is available at the click of a mouse. Luxury now is defined by great craftsmanship, with price determining exclusivity. When a Hermes crocodile Birkin bag can cost the price of a house, it's obviously not going to be found on Trade Me. Yet we now live in a more democratic society and the likes of Hermes, Louis Vuitton and others have 'entry level' items we can all afford.
The character Edina Monsoon on Absolutely Fabulous once said, "I don't want more choice I just want nicer things". I would have to agree. Who needs five cheap watches when you can have one great one? I think luxury is worth investing in from a practical standpoint.