The reason is simple - the amount of money available very much depends on where you are on the overall standings. Good luck with finding sponsors who can fund you let's say 80% of R5 budget but don't care about overall results.
Exaggerating: so the R4 guys will take all the sponsorship money away from R2 drivers?
ku ois neljä pyörää ku vetäis ni ois vähän eri sekunnit kyllä pätkillä, sen mä takaan
....and a BIG Crash on final stage (Crew ok)
Rally2 (ex-R5) News