This is easy go to opm.gov and click on benefits and salaries. Most Deputy Marshals make anywhere between $50,000 to start and $115,000 at retirement.
It depends on your rank, time in service, if your married and or have dependants
"How much money do you ask for this (service)?"
Not much
As much as they see fit. Its their service and time they are offering for your money.
how much do you get a year being an actor
how much money does a account manager earn
The Secret Service has much more power then being body guards. They investigate counterfeit money, and investigate threats against the president, and also investigate electronic crimes.
a buget
On Her Majesty's Secret Service grossed $82,000,000 worldwide.
however much you fundraise. Its not about the money, so don't expect much.
as much as you can steal
long live vader