I would say it was of much greater interest if there was any actual change in the design of the master die, rather than minor inconsistencies of application of date digits to a working die prepared from an undated master. Erroneous or erratic repairs of a worn working die are also of great interest, but the effects of normal wear and tear much less so.
While unintended date variations are of interest to some, I doubt they will ever command the top prices unless associated with other design changes.
Jerry