i think it all has to do with intent. for example, if i sold or traded a plug to you, then we're good. do what you must. but if you told me that you loved the color of the pencil i just painted and i gave it to you with the understanding that you were going to fish it and then sold it, that to me is a different story. by the way, you'll never see my mac stuff on ebay!!
there like stocks, after you buy them they split hold on to them long enought they may split again just jokeing....if someone's selling plugs like salty or lex,afterhours...then its ok to sell on ebay.. it there not then its not ok in my eyes