Sadly, it is very hard to get the data, and what we see is heavily spun.
As for the market value of PhDs, it tells us that quant compensation would have to drop very very hard to stop being attractive.
Entry level academia is often a much more stressful environment than banking, even in the current climate. I see numbers like 10-15% of the industry getting chopped this year.
This is the worst year for ages, but in academia, that would be seen as a
good year.
When you go work for a bank or HF, you get a job.
That's not the standard process for a postdoc who typically gets a fixed term contract, with no guarantee of it being extended.
No quant has yet been the top dog in a bulge bracket bank, but thousands of quants have become rich through banking. Quants have been the top dog of hedge funds since before the term hedge fund was first used. Ed Thorpe has been doing this for decades.
Compare this to a Chemist or Physicist at an industrial firm. Your career path does not lead to the top, and that's just not competition. Look at the boards of IBM, GM, P&G, GSK, et al.
All "technology" based firms, yet most of the elite think an electron is the size and colour of a small pea.
As a headhunter, my input data set is of course biased. People who are happy in academia rarely contact me, so I get the malcontents.
But there's a lot of them.
Bureaucracy and internal politics is on average worse than banking.
I would venture there is more "respect" for the individual at even the hardest know bank than the average university.
This is because of the rational response to the different stimuli.
If you quit because you've been screwed, useful and sometimes critical work will stop happening. Obviously GS or UBS is not going to crash because one junior quant has a nice lunch with P&D
But, decision making people will suffer if you go far more often than in a Uni.
Like banks, Unis have people who bring in money, but the raton is entirely different. About 3% of the university are in the position where their departure would make the university poorer.
Most would free up funds that the politically powerful people would use for their own projects.
In a bank, it's nearer 20% of people whose loss would impact P&L.
That is not the banks being "nice", just rational.
And of course, I used "average" behaviour. I've seen terrible mismanagement in both sectors, bullying, and other defects.