Dear FFG, Dear Fellow Players,
I think nobody of the FFG-staff ever seems to pay any attention to the "income" of people in the game world when setting prices. First, I supposed this to be an old Black-Industrie-Issue. But now I think it is not
On p. 126 of the "Blood of Martyr", we have price lists for which the clerics of the cult perform things like giving a blessing on or taking a confession.
By RAW established by BoM, after a confession 75 thrones are charged.
Full stop.
This would, of course, wonderfully explain while everyone in the Imperium is **** poor. A regular worker will spend all of his surplus every two month to confess. Ha ha. Oh so very funny.
Yes, confessions has a very high ingame benefit for player characters (reduction of the next Insanity points by 1). But in game world terms, I say that this price is completly beyound any scope of reason.

