It's a recurring theme throughout history that products or services there were once only available to the wealthiest elite of society eventually trickle down to everyone, often due to improvements in technology.
Think of a product, and it was once unavailable to the masses: refined sugar, spices, cars, etc...
A significant luxury that the rich enjoy is having personal shoppers that eliminate the hassle of having to wade through this crap themselves, deal with deliveries, and return things if they don't work out.
I can imagine a web site that works like that, but utilising efficiencies of scale to bring the cost of this service down to mass-market levels. Affordable by the upper middle class, instead of just the multi-millionaires.