you can't put a price on sparks
The Doctor is such a consistently well written and developed character that he almost feels like he's from a different Star Trek series at times.
Probably one of my favorite episodes across all of Trek was realizing in the one episode it was the backup of the Doctor in the future and not the actual one. Kind of blew my mind at the end when I realized it
They kind of ruined his character near the end of the show though or stopped using him all that much, I can't remember. The Doctor episodes were always the ones to get excited for