Many times I lost items... Not exactly my, because I not buy, I try bid... And I lost because I not can enter in game for many times in one day.
But, if in future have one Menu in site just for use Auction House and not need enter in game for this... I can use that menu in my Tablet and my tablet stay whit me for most time in one day.
This has been discussed before several times. The idea is that an auction house app would help people such as yourself with auctions, however it would further lengthen bid wars and auction snipes within the game.
You have lost several bids before... Now with such an app you would likely lose more, especially if they were sought after items.