The problem is funds - anet doesnt have the funds or staff to fully investigate and redo ( or w/a ) the items and if they take any staff from gw2 theres a public outcry as gw2 will be delayed.
Blizzard well lets see x players paying x monthly x12 = money aney doesnt get because we dont get charged monthly to play a game we already paid for.
Think of the hackers/scammers as owning a chopshop - then trying to find which car had your nut which you so want back - crap example but it shows how big a job it is.
Also how much time and logs do you need to get thru - what you may think is an easy task actually isnt always as easy - when mr X was hacked and his items were sold is the time of day known , a big factor is How many players were online at that time ... maybe when gw2 comes out the 2 staff members may have got thru part of the logs.
Yes its bad when this happens but then again its a game and even in real life theres ppl who have been robbed/burgled and never got their items back - but ingame its easier to get most things again when real life it isnt.
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