Actually, when you use the term 'grand scheme of things', it is the only way it could be viewed as an advantage. Less time invested in leveling a character means more time invested in gearing a max level character. It is only not really an advantage if we consider that in WoW there is no goal except for the one you set for yourself.
What is the issue with other players surpassing you gear wise? How does it affect your character or your guild? Does it hamper your progression or interfere with your game? I understand that some players set their own goals with world, server, faction and class firsts, but again, these are independently set goals. If skill and dedication are the determining factors then a random player with gear shouldn't be a problem, unless that player is actually more skilled and dedicated. I don't see a connection with gear and skill in the same way you do. Dedication maybe, but it takes a certain amount of dedication to level to 90 as well.
If you are against selling heroic gear, how would you feel about selling gear that makes you 'heroic ready', so basically normal mode gear, maybe halfway through a tier. This would save a lot of players the grind of going through lfr, flex and eventually normal modes.