Keep Track of Financial Information
You can store your purchasing information, as well as your selling information. When did you buy it, when did you sell it, how much and from whom. It also automatic computes profit for you.
It also prints out financial report. Financial report prints out everything you bought or sold in a month, or a year, or any period of time you specified.
Here is an article talks about why it is important to keep track of your collectibles. Collectible Insurance