With my knowledge and understanding about bitcoin, I want to ask if marketing of products or buying and selling of other products in bitcoin forum is possible or bitcoin forum is all about cryptocurrency and if probably it is indeterminate or fortuitous to venture into such transaction in bitcoin forum, what is the hypothetical or promising level of making such action or purchase a successful one, and what is the gratification and detriment of such interprise.
You only need three things: common sense, a person whom you want to deal with and a
highly-trusted escrow.
Knowing that you're in a forum of basically anonymous Joes, it's hard to actually find a deal that will not get screwed, or you ending up scammed. Escrows are somewhat the means to combat that, though be careful that there are also trusted people that can turn against you and start doing their scamming ways even though they have built quite a rep.
Trading in this forum is still pretty much active even though times have changed. You may find some good deals from time to time however, if the deal is too good to be true, ask questions and do some research first before getting into it. The cons, however, is that trades are usually slow, although with a trusted escrow, trades/deals will be smooth and most of the time, funds would be safe.