While not due to pricing structure, more to do with them going through a period of being crap, this has happened in Bradford. Among the under 10's you very rarely see a City shirt. It's mainly Manure and Liverpool. Citeh have come to the fore lately but, must be a Northern thing, you don't see many Arse or Chelski. Another trend is Real and Barca and the kids genuinely say they support them, it's not just something they've bought on their jollies 
and complicated