JWRC entry fee= 2500 (just to take part in series)
Each event entry fee = 3895 EUR*6= 23370 EUR
Renting DS3R3= ca 35-40 EUR/km= ca 15 000 EUR event= 90 000
around 24 tyres for one event (approximately 300 EUR/tyre, mostly including VAT)*6=ca 43 000 EUR
+ accomodation costs for small team in EU= ca 5000 eur
+ travel costs for small team in EU = ca 10000 eur
=ca 175000 EUR
+ fuel (if not included in rent)
+ insurance/damage to the car etc.
So, season cost would be roughly up to 200 000 eur.
You can buy DS3 R3 as well... for around 75 000 EUR.