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They HAVE to have a side income for spending money, or choose to because its fun? I understand your point though. I was being a little facetious :)
Turkish-
Their wealth is inherited in the form of huge tracts of agricultural land and a struggling hotel business. Both businesses are in bad shape and requiring significant investment to make profitable. Any surplus cash is going straight back into those operations to try to make them profitable.
Sure, you can sell assets to raise some funds but people tend to be aversed to doing that if their wealth was built up over generations...people tend to feel that they are stealing from their grandchildren if they do that.
They have options and they will hopefully be in a better financial position in a few years but at the moment, the income from home made jams and condiments pays the food bills.
Stonehedge
For what its worth, I know somebody with a net worth of over $100m who makes and sells jam for spending money. Cash flow problems aren't reserved solely for the poor.