I wonder how they create an unfair advantage of what? Nobody is in a direct competition with you except yourself. Nobody of you is even remotely close to be in the 0,0001% of players that go for World first. None of these grant any real cheats like gold or free items, nobody cares how many mounts you have or achievements or how far you are in raiding, the only people that would even remotely care are people that use mods to log their dps and toxic people.