You sure? People with families tend to spend more money (out of necessity). It's easier for people without kids to save up more money.

It's easier to meet your basic survival needs as an individual, and thus you have more disposable income for nonsense commodities. Everybody I know who is single and has a good job buys tons of junk they don't need (or often even want). It's the norm.

It's a variant of norm. Another variant is to throw away anything one doesn't use for more than a year, rent-not-buy most of entertaining stuff, including musical instruments, game consoles, fancy cars and dresses, holiday villas and yachts. Actually, hoarding and junk collecting is a prerogative of the poor.

Even renting "fancy cars and dresses, holiday villas and yachts" sounds like an opulent lifestyle, where someone has a lot of disposable income and is finding was to entertain himself with the extra cash.

It may sound like that, but it may be the other way around. Here in Moscow I can rent SmartForFour Cabrio for 720 RUB (10.80 USD) per hour via carshering app, insurance and city parking included. 45 feet sailing yacht on Mediterranean costs 2500 EUR per week and is suitable for up to 6 people, berthing and fuel will add 500 EUR, cheaper than most of hotels. Check out AirBnB for holiday villas)

Yeah I was literally doing some research on an electric unicycle that I probably won't use too often.

People with families spend more money on commodities. People without spend more on luxury goods which have higher margins.