Well according to a BusinessWeek article amp’d mobile who was targeting young professionals by advertising like there was no tomorrow on MTV, had a fast growing user base.

However nearly half of their user base neglected to pay their bills. 80,000 of 175,000 subscribers stopped paying their bills.

amp’d mobile also owes 100 million to creditors such as Verizon whose network amp’d mobile uses, Verizon is owed the most money 33 million.

I guess when you advertise during work hours on MTV the market you are reaching isn’t the market you really want. Young Professionals have jobs and if someone is watching TV at noon chances are they don’t have a job.