The only reason you were asked to Trade a staff member was for the simple fact that your join date is Yesterday and you are already claiming to be selling 1200m 07 GP. No one is saying it's not true but the facts speak for themselves as looking a little dodgy.
As for the PM limit it will not be removed, in the past there has been several occurrences where users join and spam their sites or viruses across all members and some fall for it. It's there as a safety feature and If you wish to have a bigger PM limit with freedom then purchase VIP.
Your thread will not be reopened either, you can always stick around build somewhat of a reputation then attempt to sell your gold by all means. If you really are selling that amount then Gold sites will be your best bet and offer only around $0.2-0.4 less than anyone else when buying so that's your best bet.
Hope that clears things up for you.