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:
Percentage of Secondary Market Price
Never Removed From Box
Mint In Box
No Price Tag
Slightly Damaged Box
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.