There is a social aspect, for sure, but the clubs i've personally been to IRL, the music is so loud that even just shouting "do you want another drink" to your buddy several times becomes a work out for your voice box. I'm not sure if the clubbing experience is different in america than where I live but I find the GTA:W nightclubs to be a really immersion-breaking experience; most of the people there act like the music doesn't exist, talk with their friends for a bit and seem completely sober from head to toe, then hop into their really expensive sports cars after 10 shots in the space of 20 minutes and drive to the next club to do the same thing all over again. Whenever i've been to a club in GTA:W, i've never felt that "energy" you mentioned. Just a very lackluster social hub. So yeah I think the portrayal inside nightclubs is something that needs talking about more than the amount of nightclubs.