
Let's imagine you are Joe Diamond, and this is the first card that shows up on your hunch deck during the first turn of the game. You have 5 cards in hand. This card can already be played for a discount of 7, for 2 clues at 3 resources. That's really good.
Card effects often value buying a clue for 1-2 resources - see Scene of the Crime, Intel Report, Connect the Dots, Working a Hunch, etc. Drawn to the Flame is a notable exception but handling the ensuing encounter card is a cost that is often equivalent to 1-2 resources or even more. So, if you can get this down to at minimum 4r, which outside of Joe, is 6 other cards + Extensive Research in hand, then you can feel comfortable playing this knowing that you are paying the average rate for what a clue is worth in money. If you can get it even lower than 4, than you can feel great about playing this.
Notably, Joe can play this for 0r if it is on top of his Hunch Deck and his hand is full with no hand size bonuses.