Interesting topic and read, there are obvious pros and cons to both sides of the argument here.
I for one am excited when I spot something new at retail (whether it be common or super rare), if I can share that sighting and have someone use that info to make a purchase and share that excitement, than who cares who they are?? We are all here because we love transformers, why starve others of the joy we have in collecting?
That is why I post sightings (although I live in Bundaberg and maybe no from here uses it)
But in saying that I can also understand the reasoning as to why some would like this implemented.