I have had this problem for the longest time. I stock my vendor full of goodies and log off. Then when I log back on I have sold a lot of stuff but I can't remember what I sold or for how much. It would be nice if there was some sort of sales history for vendors.
For example:
It would be easy to do just click on the vendor to open the context menu and select Sale History. (Or whatever you want to call it.)
Then a menu like this would pop up showing you all the details.
Remove - Clears the item history from the list.
Item - Name of the item that you are selling or sold.
Stocked - Day and time you stocked the item.
Sold - Day and time the item sold.
Buyer - Name of the person who bought the item.
Sold For - Amount the item sold for.
Fees - Amount of gold you spent keeping the item stocked on your vendor.
Profit - Total amount of gold you earned for selling the item.
And of course you would be able to sort the list by item name, date, profit, etc.
And for those freaking out because they don't want other people to know that they bought from their vendor...They could add an option to the players context menu to toggle Yes, show my name when I buy from a vendor or No, don't show my name when I buy from a vendor. If they even decide to include players names.
I guess all that information wouldn't really be needed. It could be simplified to look like this.
Or even simpler.
Just a neat feature I wish was in the game
It's a pain to use text files or pictures to try and remember what I sold and for how much.
Heck, I'd even be happy with something like this!
(I know, I know, I did horrible on the pictures. They aren't much different. I could of done better, blah blah blah who really cares. They are just an example.)
For example:
It would be easy to do just click on the vendor to open the context menu and select Sale History. (Or whatever you want to call it.)

Then a menu like this would pop up showing you all the details.

Remove - Clears the item history from the list.
Item - Name of the item that you are selling or sold.
Stocked - Day and time you stocked the item.
Sold - Day and time the item sold.
Buyer - Name of the person who bought the item.
Sold For - Amount the item sold for.
Fees - Amount of gold you spent keeping the item stocked on your vendor.
Profit - Total amount of gold you earned for selling the item.
And of course you would be able to sort the list by item name, date, profit, etc.
And for those freaking out because they don't want other people to know that they bought from their vendor...They could add an option to the players context menu to toggle Yes, show my name when I buy from a vendor or No, don't show my name when I buy from a vendor. If they even decide to include players names.
I guess all that information wouldn't really be needed. It could be simplified to look like this.

Or even simpler.

Just a neat feature I wish was in the game
Heck, I'd even be happy with something like this!

(I know, I know, I did horrible on the pictures. They aren't much different. I could of done better, blah blah blah who really cares. They are just an example.)