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This has been true for as long as work has existed as a concept.
Think the difference is how much effort your hobby is to turn it into a profitable business. 
My art is never going to be profitable as it takes me hours but I doubt anyone would pay more than $25 for it. 
But if you have prestige or enough talent to where it maybe takes 20 min you could sell it for $100 and boom. 
This is definitely true with writing as well. It can take you hundreds of hours only for your books to not sell at all. >

I know a lady who does abstract paintings. Spends 20 mins painting in canvas. Waits just long enough for it to dry and brings it to this place and sells it for thousands. It’s like wtf. >

Gotta know your market!  And also know how to network and market your wares.
I tend to like paintings like that and could pay good money if it "speaks" to me.