Because the bulk of people who still play it aren't playing it for the thrilling experience of talking to random people in Kavala Square, they're fighting gang wars and capping cartels. When you have a server that slowly becomes more and more combat-oriented than RP oriented, of course you're gonna see less RP and more combat. If you want RP, apply for a modded A3Life server, cos it's highly improbable that's gonna change anytime soon.