I'm surprised this thread blew up so much. 2/2 for Bit Buckets controversy threads.
I find it interesting that the term "intent of the rule" is used so frequently in this thread. As none of us are on the GDC, I doubt any of us have a thorough understanding of what the "intent of the rule" is. My take on the rules is that we have a limited weight worth of withholding parts so that a team cannot show up to a competition with a completely brand new robot to replace the bagged one. I do not think the intent of the rule is to limit how many spare duplicate parts can be brought to an event, although the 2014 wording acts as a limiter on this. Again, not on the GDC, so I am simply posting an opinion.
Also, I'm still waiting for a team to build three robots, bag two, and develop the third as a practice robot at home. That should lead to some fun discussion!