overprize
/ˌoʊvərˈpraɪz/Definitions
1. verb
to value or prize something too highly, or to set a price that is too high
“The artist’s work was overprized by the wealthy collector, who ended up losing money on the purchase.”
2. noun
an excessive or unwarranted estimate of the value of something
“The overprize of the artist’s work was a major factor in the market crash.”