Wall Street is at best ambivalent. The size of the accounts is nothing big. How many Wall Street firms do you know that are running after people with $5,000 accounts?
If employees need to stay late in order to curry favor with the boss, what motivation do they have to get work done during normal business hours? After all, they can put in the requisite 'face time' whether they are surfing the Internet or analyzing customer data.
You have various institutions like law firms and accounting firms which bill by the hour. I'm really against that. You have an incentive to go slowly, be there as long as possible, to over-research things and over-staff.