I figure that the average Wal-Mart bike rider rides only 2640 miles a year. And that's only if they commute to work 5 miles each way. 22 (Days a month)*12 (months)*5 (miles)*2 = 2640 miles.
I think the average Wal-Mart biker rides 500 to 1000 miles a year. Maybe. The number of people who commute on a bike and buy their bikes at Walmart.....well, let's just say it's rare. I'd bet 99.9% or Walmart bikes are used recreationally, and not by R600duraace either.