Well I may be in the States, but the main reason I see people not discussing finances is the fact that most people don't have real money and finance a lot of stuff on credit. It gives them the appearance of looking rich when they own nothing and have a negative net worth.
I have no car loans, no student loans, and no credit card/consumer debt.
(example buy a new car and drive it off the lot, you now have a net worth of about -6 to -10k dollars)
Also there are so many other ways to measure your real value of work like stock options, retirement packages, benefits, job security, etc.
I don't mind disclosing what I make because as a teacher, you can look it up on a friggin' web page that our district posts.
I am 32 years old. I am starting my 10th year of teaching and will make $53k a year. I don't know what that is per hour. I pay no income tax because of my various real estate investments (rental apartments and homes) They give me an income of approximately $3600 per month but after mortgage interest, repairs, improvements (sometimes to my home, and sometimes to theirs
) I owe no income tax.
As for benefits, I have a full pension (not a crappy 401k), full medical and dental, I get 10 paid sick days per year and I am contracted to work 176 days per year. (I get 3 months off and obviously all major holidays)