An item's estimated worth is just that, an estimate. An item's estimated worth is based on the YuleLog Price Guide Mint In BoxAverage Price Field and the Condition Field. YuleLog calculates this value based on the following rules of thumb for typical Market Prices:
Status
Percentage of Secondary Market Price
Never Removed From Box
105%
Mint In Box
100%
No Price Tag
95%
Slightly Damaged Box
90%
Damaged Box
85%
No Box
80%
Signed Items
If an item is signed by the artist(s), a multiplier of 0.25 (25%) is added to the estimated worth.
For example, here is the calculation for the estimated worth of a signed item Never Removed From Box, whose MIB Average Price is $100.