Most of the times I log, it's primarily for the (snub) PvP. This game's group snub brawls are unique among all the games I've ever seen or played, and my only regret is that I spent so many years trying as hard as I could to avoid that particular aspect.
That said, and without contradicting myself (I hope), the only reason I am still around is because of the setting and the RP. I wouldn't be interested in playing this game as a purely PvP experience, just as much as I wouldn't be interested in flying around an entirely sterile environment without some form of aggressive player interaction being present and accounted for.
In my experience, though, it is a lot easier to find a halfway decent fight than it is to find a halfway decent RP of any substance whatsoever - probably because players that are stronger in PvP will fight just about anyone, while a lot of the quote-unquote "roleplayers" stick to their known friend groups and type their text there. For someone like me who really can't get on board with too much premeditated roleplay (unless the characters involved really, really mesh well), I always feel a bit disheartened and aggrieved at the difficulty I experience in finding RP interactions that are truly organic.