[WingedDog]

Squirrelloid
20 PD is actually about 200 gold, so for a 15 province empire 20 PD for every province costs like 3000 gold. Assuming we have an income of 1500 gold - it's a two turns investement for confidence you are not striped of all your provinces in a single turn and thus of all gold and gem income. At least until late game. Worth it or not everyone decides for himself.