Darkesteyes
The list of shows you kindly provided:
Benefits Street.
We All Pay Your Benefits.
Benefits Britain. Life on the Dole.
Benefit Claimants and Proud.
Britains Benefit Tenants.
How to Get A Council House.
These all have one thing in common ,they feature - shall we say, 'less educated' people. These people are quite easy for a well educated , silvery tongued journalist to manipulate into participating in his programme with promises of being on their side, telling their stories sympathetically, even money. (This is exactly what happened in 'benefits street').
The same tactic simply does not work with the rich, the conversation would go something like this:
Journo: Hello Mr banker / businessman , I am a journalist working for xxx and we're making a show about rich people.
Banker: Fuck off, not interested, you'll just stitch me up!
Journo: But if I may explain a moment, our show will be...
Banker: Listen , I said fuck off, now stop harassing me or I'll set the expensive lawyers on you.
And that's why there are loads of shows about benefit scroungers and none about bankers.