I am not personally motivated by competition, although I realize many (most?) people are. This fact means I can be very surprised by the lengths people will go to for "keeping up with the Joneses."

Earlier this week Ensidia exploited their kill, and got a ban and the achievement removed (although their alts got it down, so they were able to do hardmodes this week.)

Yesterday I posted about Tasty Beverage, who server transferred but also faction transferred in order to get extra attempts.

Today we have a guild who was unable to kill Lich King on mains or alts given the limited attempts. They solved their problem, however, by having someone transfer in who can unlock hardmode for them and are now doing hardmodes without actually having killed Lich King:

http://www.wowprogress.com/guild/us/sen-jin/Premonition

This was stated in a large IRC channel. I've removed the name of the person speaking since I don't have an easy way of reaching him (he's offline):

(nameremoved) Mage in our guild got accepted
(nameremoved) Was decent at WoW
(nameremoved) Then Premo took him after they had declined him months ago
(nameremoved) To unlock hardmodes for them

And from the guildleader of the guild the person left:

Empyrea, who provided them hard mode access, was from our guild. He was promoted to full member just a few days ago. I put him in for Lich King-25 over one of our other mages simply because he had experience from the 10-man. Big mistake, apparently. Quite the eye opener though, especially from a guild I've done personal favors for. Lesson learned.

Time will tell whether WoWProgress decides that counts for progression or not, since while it's technically within the rules, it's definitely circumventing the gating system put into place to limit progression.

Certainly a lot of food for thought about where your personal "Ok but THAT'S cheating!" line comes. Like many things, while we all can agree on some things clearly being across the line, the real world is filled with a lot of shades of grey.