They are really quite rude in those threads to you, but i think the thing is the regular posters are doing ebay as: 1)a business to 2)make gobs of money.
So they don't 'get' you, who are in essence, having a yard sale in a very casual, personable manner.
With the new ebay rules, they are telling you, for example, to self-insure...but just not to SAY that in those words, which is not legal. And to NOT itemize your handling fees. They want you to CYA (cover your...). :-)
I can see this is really useful, helpful stuff, but it also isn't how you, personally, do business. You are a caring, thoughtful, kind person who is just trying to move your goods into other loving hands. Ebay is not that place anymore, apparently.
You are having entire useful threads deleted b/c of ebay's demoniacally strict, yet strangely unstated rules. You are having people ridicule clear and transparent communication in favor of finding semantic loopholes to make ebay work in their favor.
I sense sellers are scrambling to make sense of earning a living on the New eBay and want you to just do what they do. It bugs them that you don't want to do it their way. I think you are totally right to look for a new outlet for your auctions.