Putting a bunch of toys on hold for other people is just as bad as scalping.
I don't contribute to the forum much but I do visit and read the threads 3-4 times a day. i am an ordinary collector. Stopping people who are ranked poorly like me from viewing sightings is quite bizarre as you are not doing the forum any favours. And by the way, it can work both ways...I have sighted heaps of things at certain places here in Perth as I travel around as part of my job. If I can't see what's been sighted elsewhere, why should I tell others where things are.