What are Legacy items? I see then at AH, none are ever for sale at ah. Never seen anyone that had them. So what are they?
I imagine most of the Legacy items have been lost due to loss of characters. I've only seen what's up on AH now: cloak and boots and I think I saw the helm at one point. I've never seen the ring or xbow. I think it's very unlikely to be able to collect all of the pieces individually. Your best bet is to watch for someone who's leaving the game who has a 4 piece set they're willing to sell.