I started playing when DDO was released as Retail. Then after a few months stopped playing for a while. Now that I'm back the Auctions seemed to have made it difficult to play. Almost no one sells to Brokers anymore but when the brokers only give about 10% of base I can see why. I also have seen and read about people complaining about Plat sellers. If it is going to be difficult to get/make money, I almost see no other way.
1.)Make it so that when you are selling something that you get 50% of base value automatically. Then every pt of Haggle increases that by 1%. So a 25 Haggle would give you 75% of the base on items when selling.
2.)Make a penalty for people who remove items from auction when there are already bids on it. Just because someone isn't making what they wanted isn't fair to the people biding on it. I think 10% or greater penalty of the last bid would help prevent this. Maybe even give a portion of the $ penalty to the last bidder as an apology to wasting his time.
To me the 1st suggestion is the most important. I believe it would cut down on people throwing "junk" items in the auction, slow down the buying of Plat from sellers since money is easier to get, and overall make the game more fun/less stressful.