sometimes people pay for convenience, and some of us would like to profit off of that convenience. the patch notes stated about where the vendors were with the bridesmaid/best man outfits and the emperors new accessories. It sucks if you were one of the people that paid several hundred thousand for it. The NPC sells at a lower price. if you don't like the market board price don't pay it. You have an option.

Some of us are also crafters and gatherers, and we would like to see some profit from the things we make and gather, some of which could also be obtained from NPCs. We provide these things for you so you don't have to track down the NPC. its not fair to us to spend money so you can pay the same price without going to the NPC.