Selling on trading post take some time and its just worse now with the champion boxes. I get +20 different materials and for some reason it take 5 seconds to load each on TP. So i suggest a option to sell all materials, with a checklist of those you want to keep. I opened a stack of lootbags and it toke me more than 10 min to sell all so this would be a nice feature. The default price could be the one people are selling them for. Then there could be a slider or a number you could change how much up/down from the default price you want to go.