The context for my comment is the question asked in Dave's video. I never intended to act as a docent; I was only answering a question asked in the video. I offer my sincere apologies for a reply far afield from the original subject of this thread.
To answer your questions, I am describing "ethical" in a limited way, only in regard to the gentlemanly ethos loosely found in DFS community standards. The kind of flipping you describe is perfectly within the bounds of DFS community standards. Pricing in order to include fees and shipping is quite fair and acceptable. Generosity is always nice, but can never be demanded. Yes, a modified price to cover a sale is all good among friends. That is the difference: would I gouge someone I consider a friend?
At the other extreme is a type of member whose only participation in the broader community is to buy low on DFS BST and immediately flip on the same forum for a greatly exaggerated price. Legal? Yes. Is that how friends treat friends? Not in my playbook. I am here for the community (and I really enjoy your insightful posts
draebeard ). If someone gets a great deal here, there is nothing to prevent a profitable flip. However, it seems distasteful to exploit the seller's generosity by selling it here. There are plenty of other venues for sales.