There is a flood of auctions at the moment all for very similar tools. If you want maximise your sale, you want to sell different items. If you have something that is already on auction by yourself or someone else - hold on to it and auction after the other has finished. If you dont your practically halving your profits! Just something to think about...
Completelly dissagree with you, i have in stock 10 pickaxes with enchantments, that goes from level 12 to level 47 type enchantments, and i just released 2 of them since i see the market is moving. If there is a mcdonald's selling burgers already, then why is there a burger king?
I think with items as rare as they are (and useful!) these high enchantment picks will probably always have good bids.
That's why my goal at EMC from the start was getting enchantment items, i don't have more than 1 week and i might not be as rich as others but, yeah, is a good bussines