That may be the case. However, if some sellers on this site have a business that also include the sale of model railway items, sales on here could well be construed as part of that business. I would hope that everyone on here (both seller and purchaser) would act in a fair and selfless manner.
Incidentally, what should one do if a payment has been send to a member on this site and is "complete" through PayPal but no word of whether the items have even been mailed?
I'm assuming this member is on vacation of for the last week which would have been a poor time to offer items for sale… waiting patiently here tic-toc, tic-toc