What do You think? Player could repeatedly unpunished try submit "Make offer"?
This facilitation should stay, without any negative consequences/restriction for the player?
I applied here "NPC discontent" (relationship -1) for each -failed- "Make offer". As small reducing chances of a positive lottery for the next time.

Earlier, the penalty was loss of negotiated reductions. But only reductions, and often several in a row succesfull reductions was loss (disproportionately large penalty in more accidental combination, and not only during the "Make offer").
Earlier, when there was any reduction, player did not lose anything (no consequences).
Earlier, once he was big punished, and once he was not punished.