I have a troubling relationship with the concept of playing an alt. First off, I don't really get alts. I know people who have four or six or even eight level 85 characters, geared and kitted out for raiding or Arena/RBG play. One woman I know has completely filled up two servers with level 85 characters (full character window, a server she plays Horde on and a server she plays Alliance on) that can at least run a random Hour of Twilight heroic. I accept that this exists, but I can't imagine doing it.
See, I'm middling at best about my achievements in game, but there are things I've done that you can't do anymore. I mean, every time I ran the 5-man Zul'Gurub, I kept thinking about how I'm a hero of the Zandalar tribe. Shouldn't they at least try and talk me out of killing them? Shouldn't I at least have the option to say, "Hey, guys, it's me, can we chill out on this?" and then we could express our sorrow at having to come to blows?
I can't do that on an alt. Well, OK, I can do it on the other two warriors who are also heroes of the Zandalar tribe, but you get my point. An alt's not going to have all those titles I barely realized I was earning, or my Mimiron's Head, or a Sulfuras in the bank laughing at me every time I got to the trasmogrification ethereal and get a hit of sweet, sweet gear changery.