A PRODUCT is something created, brought to existence, and is something experienceable, so it is something that can be HAD. So it is entirely related to HAVINGNESS after DOINGNESS.
A VALUABLE PRODUCT, thus, refers to something that helps to something else, or to a goal, by its quality and concordancy with the related purposes of its creation.
The quality must be high. It must be usefull for a known purpose. And of course, it should not prompt to immediate destruction or re-make or correction.