There seems to be lacking a uniform consensus on this issue, and I'm not sure if this is due to an engineering, cultural, logical, or legal reason. Half the guys I ride with say to only use it once, then discard. The other half (myself included) re-use it constantly throughout the entire life of the chain.
What is the "official" recommendation on re-use of a KMC Missing Link?
Further, as it requires 25€ of tools to install/remove, what is the point of using a link only once if I can just use my existing 25€ tool to install/peen a new chain pin? In the hands of a capable mechanic, there is really minimal benefit I can see in it's use if it cannot be re-used. If it should be re-used, which it obviously CAN, albeit this is very different than SHOULD, then it's obviously of great benefit and makes total sense to invest in the tools to use it.
For the record, the UCI Continental team BigMat-Auber 93 re-uses their links.
I know many of you will respond by saying "only use it once" or "I re-use the link 17 times over the course of the life of the chain." But what I'm looking for is WHAT and WHY the official recommendation is what it is.