I don't, I have two Titans, and the reason is because I was really, really bad as a Hunter Guardian in PVE and pretty good in PVP but I didn't like the Hunter. For me it seemed very Crucible centric. I still think that Gunslinger is the best PVP class in the game and the hardest for me to play against. On the other hand, I'm incredibly good as a Titan mainly in PVE but I would consider myself an above average PVP player. Just never made sense to keep playing the Hunter because it was frustrating and having two Titans allows me to get gear quicker.