Just like any other company they care, they care about making money with as little expenses. Which is why we are always getting these PvP events, a few changes to the rules, get a couple of guys to make some emotes and ghost shells, and there you have it - an event!! Which they can make money from people buying silver! The same reason why we don't have any new PvE content is the same reason why we don't have any new PvP maps - it takes too much and resources. Yes srl had new maps but srl is something which was already in the pipeline for destiny and maps I assume only needed a polish before releasing. Still I actually enjoy the PvP side of things in destiny :)