I flew business class a long time ago when the difference in price was only 600 dollars more than coach 

It depends on the flight duration or destination imo


Would be great if flying in first class became more affordable.

It’s comfortable but is its utility value really 3-4x the price of a ticket in economy class?

teemupleb

econ

This is bizarre, and maybe you're not worrying as much as you should

economy

Business class prices are so absurd that I always suspected that some kind of co-evolution takes place. 

1) Goverment (and perhaps corporations?) spend money on travel regardless of the costs (its not 'my money' so I want business class!)
2) Airlines notices that ticket buyers are almost infinitely price elastic so they increase prices
3) (Optional step?) Airline representatives corrupt govs into signing business-class travel deals.
4) GOTO 1.

Perhaps one source that powers up this flywheel got cut off.