Why the miss? One potential factor: The average MetroPCS customer is spending less money each month on service than it did a year ago.luis vitton.The carrier's average monthly revenue per user dropped to $42.22, 3.5% less than the $43.75 that subscribers spent during Q1 2007. MetroPCS attributes the drop in spending to more people using family plans and certain features that used to cost extra being rolled in to standard subscription plans.