Because banking makes a hell of a lot more money.
Outside of London (as I'm sure you're aware), this could be offered as a senior developer salary.
Anybody saying otherwise has been reading too many tabloids.
You can find out more details about salaries in this area by using a site like glassdoor.com. This 100%+ bonus culture is simply not true (now).
Typically a VP in a high-performing group will outrank an ED or MD in a lower-ranking group (say, $150+300k vs. $300+100k).