Originally Posted by
sam_cyclist
It just seems like you have no criteria of a practical or logical nature which dictates much less guides your decision making. Instead you have:
-a desire for a shimano crank for vanity
-a desire for 5800 or 6800 because it's heavily discounted by a UK online seller
Personally, I'd agree with you. I try not to "upgrade" unless I have a verbalize a specific reason for doing so. At the same time, understand that, "because I want to," is the only reason you need.