This numbers are totally overrated and pumped in my opinion. Maybe presented for sponsors, so after the season you have 500.000€ or more in your pocket.
We all know how much per km is Rally2, how much are entry fees, tyres, fuel etc.
It is true that price for the car can vary a lot depending on team, but I hardly believe you can spent more than 100.000€ for one wrc2 event with big PET.