According to this report on AdultFYI.com, Nick Manning was on Howard Stern's show last week to discuss his life.
Interesting bits are:

"Nick then said he had a master’s degree and used to work on Wall Street before he decided to dedicate pursue a career in the adult industry. Nick also noted he owned a number of adult stores and video distribution companies as well, which he added was how he makes most of his money."

And:

"A caller wanted to know how Nick was able to prevent himself from having quick orgasms during sex, and he replied he’d conditioned himself to take up to 2 hours before ejaculating, even in his private life."

And my favorite:

"Nick also mentioned he worth over $1 million thanks to his career and business interests, but added it was “a tough job” that required people to be “great athletes.”"

If you had a Masters and a job on Wall Street, would you quit to enter the porn biz?