There's no right way to deal with the sales threads atm until Paypal or something very similar is up and running so that members can easily upgrade and pay their subs in, I'm damn sure that admin are trying their very best to sort this out, after all it's them that are losing money here not the membership.
I agree with any business that runs itself for it's honest clientele, you will always have an element of scammers etc but generally they don't last long here and they don't cause too much grief for the membership as a whole as they are outed fairly quickly, that said when a noob member gets fucked over it gets my gut going, older members should really know better than do a deal with someone who is offering something that is to good to be true and I consider myself a noob too!
As for ways to solve the dodgy sales etc, a couple that have been tossed around that I think made sense
For members that were Platinum/ViP before the PP issues came up and only yearly subs members, reinstate them as such until they can sort out Payza payment, give them 3 mth grace.
Minimum post counts, I think if we had a count of say 10 before a noob can even view the trade sections and 100 before they can sell anything, unless of course they Pay to upgrade via Payza.
These couple of measures I think would help, but in all honesty you still won't stop all the scammers, they are motivated by one thing and that is parting you from your hard earned for bugger all in return
Tread your own path.............
Edit: To add that when I first joined I did so because I loved the place, great people abound with a wealth of knowledge of horology that is hard to beat, I was not in it to buy a watch from the forum but to gather the knowledge I needed to buy a decent rep watch, which incidently led me to buy a Gen instead (to many dodgy reps!) but my point is that my first purchase was from a Trusted Dealer....not from the boards