As most of you know, I trade on various sites.
I largely withdrew from "youknowwhere" at the beginning of last year, because I didn't like their ever changing t&c's.
Here we have the forums, which are great and offer support to many of us, be it in regard of selling or personnel problems. The same applies to one of the other sites I sell on.
The 3rd site I sell on, the forums are a waste of time, but the customers are great, where it comes to direct contact. I had a really good result today and received messages from several of my regular customers congratulating me on the sale.
On the bay I've rarely encountered anything personalized/friendly on the forums or from existing customers.