Of course, there are classes in all countries. Also in socialist countries like the Soviet union, where officially no class differences existed... We can discuss this for ever, I guess. Class is probably something that some people would like to include in the game – and some not. Both is fine to me – people should make their own style of gaming.
Having that said – sometimes I get the feeling that there is a very strong, but only implicit, middle class norm in many RPGs. For example, I guess that most of (not all of) the types in this game have a subtle middle class flavour. No, it does not mean that I say this is a bad capitalist game. I´m just saying there is something political hidden in most RPSs – and also in this game, for sure. Probably it has more to do with the genre than the agenda of the writers.
In Let the Right One In, several times mentioned in this forum, there is a strong but quite implicit political component. It´s about teen age vampires for sure, but also about the Swedish class society and it´s obvious failures. The suburb is a scene that mirrors the Swedish society. The story is connected to a quite long tradition of Swedish political fiction. For me personally, class could be included in this game in an interesting way. Not as strong political propaganda, but as a part of the fictional frame. Class and money matters for kids. It could be a part of both the setting and the rules.
For example, what would it mean from a gaming perspecitive if one of the PCs had rich parents and lived in a huge villa, while all others lived in smaller apartments? Or what kind of dynamic could you get form a really rich NPC villain?