Depends how Synergistic your secondary is with your main, for classes like M/R or M/W there's no real benefit to leveling beyond 50 besides the stat gain from having a secondary class. Classes like R/S though you should get your scout up to 70 to max Swiftness and also VA/Shot depending on what you're going for (since those skills are useful in siege).
Yeah, that is the basic idea. How much of the secondary class active or passive skills you use determines what you make secondary to be.
Also, that's a stupid thing to say, I say M/R/W on purpose because that's the way my friend is setup, he sieges on M/R and does instances on M/W, honestly it's not a bad setup, third classes gives you a new secondary for your main class.
I have a few choice expressions on people who create PVP-specific classes. Those expressions will likely get my post censored, so I shall skip them.
I however am leveling up my third to do off-tanking because it'd be helpful to the guild and I can use my accessories and stuff on my third, it works out well that way so I don't have to completely re-gear another character.
You are 70/70. You have little to gain in main classes. Yeah, TP, sure, but at some point you have enough TP for what you really need. So might as well get a third at that point. You are using this for intended purpose of the third class, which is "well, some flexibility for maxed out people"
He is 55/54. He should be focusing on two main ones. And I see too many people who get third and then get stuck on their main two with not enough XP to level.
But I mean I am at a certain stage in the game, but I don't think it's right to be so limiting and say 'third classes suck never use them'.
I say we go with "for people who are not at the point where their two main classes are endgame or close to it, and who dont hate their main classes, third class is bad bad idea". That better?