My general thoughts on column re-organization:

1. Make Item column wider. Make Type column smaller, and maybe use abbreviations to make it even smaller still.

2. If possible (i'm not sure that it is), allow for columns included to be configurable.
2a. If not possible, Wealth column is the least useful for me, and should be last, if it is included at all.
2b.. Deposit and fee are next least important, since they can be calculated based on the item and sales price.

3. Seller and Buyer columns are exclusive. I would consider consolidating them. You can color coordinate (seller is green, buyer is yellow, or some such) if desired. You might also get fancy, and if you are filtering to only show auctions, change the header to buyer, and if only showing bids change it to seller, otherwise buy/

4a. I would consider adding stack size to the display, but I'm not sure its absolutely needed. Only if there's room (it wouldn't need to be too wide).
4b. Rather than have separate "XXX per" columns, consider using the approach used on the CompactUI, so that there is a checkbox that converts the total amounts (for bid, buyout, and profit) into "per item" amounts. (Note that this is for display only, and doesn't change the actual sort.)
4c. If you do this, you should probably also do like the "price" column in appraiser, which can be clicked multiple times to sort by total asc, then desc, then changes to sort by price per ascending, then descending. (Note that the sort doesn't actually change the displayed value.)

5. The actual columns used are a little confusing, perhaps just relating to their titles.
Outbids display a number in the profit column. There is no profit in an outbid. I assume this is just the total you bid for the item.
Auctions won display values in the bid and buyout column only. This is weird info to have, do I really care what the bid and buyout values for the auction were? (The best I can come up with is if I was going to try to create some metric that tells me when a bid price is close enough to a BO price that I should BO instead of bid, but that's a stretch.) And there's no way to tell which of the two prices I actually paid. Did I win the bid price, or the buyout?
Auc expired displays values in the bid and BO columns. this makes sense, so i can see what hasn't worked for me in the past.
Auc. successful displays values in the profit columns. This is also sensical, though I could see the case being made for wanting to know the bud/BO prices you used to sell it at that amount. I realize this data isn't available from the mail, but i'm not sure it is from the expired mail either. are you doing reconciliation?

I guess first I would rename "profit" to "Amount". If desired, you could do smart renaming to something else depending on what items are filtered in/out. Then I might consider change which data you collect and display, as above.

I have additional thoughts about what should be the default sorts, but they are listed under a separate ticket.