For me at least, it is of NO use to have multiple PP goodies IF they are purchased from different dealers aka more than one source. Buying from multiple sources surely can net one cheaper acquisition pricing, faster accumulation of collection but the net end result is that when one gets to the stage of collecting heavy duty pieces (repeater/split second perps etc) requiring factory approval/recognition, what one is faced with is an inquisitive "who are you" query from the factory AKA "sorry we are unable to accomodate your request at this time OR our waiting list is currently closed".
A sad but more often than not true reality some of today's crop of collectors are facing.