Better Call Saul is about a family of lawyers, the Big Bang Theory is about academics, and Silicon Valley is about tech millionaires. I'm not sure what you're seeing there.
The Big Bang Theory has two characters who worked as waitresses. One a struggling actress, the other putting herself through school.
The Silicon Valley guys were broke. Jared lived in a shed.
Two of them are great shows, you should watch 'em!
Better Call Saul is about a poor lawyer who works out of the back of a nail salon. Not exactly rich. Yes, his brother is, but the show is about Saul.
Big Bang Theory is about guys that live in apartments, and they don't seem very rich to me. Maybe they're headed there, but they aren't there yet. I'll admit they don't lack for tech/nerd toys, though.
Silicon Valley starts with a guy in an "incubator" who is clearly struggling, and then hits it big. It at least starts about a guy without money.
This also applies to the science and the social issues in BBT. It's not exactly a very heavy show.