Some people may agree, some may not.
I love to play rogue, tbh i have 2 horde rogues and 1 alliance rogue. I have done the full darkmantle quest line for my undead rogue and I am half way through on my Orc rogue.
I appreciate it doesn’t cost loads of gold but for some people the amount you have to spend is a fair amount and the time it takes, well it took me 18 hours in total and that was with guaranteed groups with the guild I am in.
My suggestion is to make the set account bound, so after you complete the questline you can buy it from ORG or Stormwind for either the dps set or tanking, aslong as one of your chars has completed the questline then the other chars you have of the same class should be aloud to buy the darkmantle set from the vendors without having to go through the questline over and over again.
Aslong as they had collected the tier 0 set then they could swap it with the tier 0.5 with the cost of gold or tarnished undermined reals.
This would give people the incentive to create more alts and feel that when they hit 60 they get a good set of gear to jump into MC, ONY, and the upcoming BWL etc…
Just an idea but it would be great if it was put in the game.