Bill Zebub
“It’s probably Matt Mercer’s fault.”
It's not 0 cost.
You have to make a skill check and if you fail you might get a completely false reading.
What's the support for that in the rules? Is the DM rolling secretly for the player? Or using 'passive Insight'? Or are you expecting the player to roleplay believing the false reading, even though they know perfectly well it was a failed roll?
Or you might succeed but piss of the target.
And what's the support for that? Is that an Insight check, plus a Deception check to avoid being detected?
And there is a counter skill, which a decent percentage of opponents will have (especially in an intrigue heavy campaign).
That doesn't actually make it risky, just more difficult.