it deppends on the lvl of the star if the star is lvl 2 or 3 if you fail you go down 1 star from lvl 4 if you fail you stay on the star and just loose the bleu medals as the failing change is gething bigger its kinda fair the bring that up in the game . i dont know if there comes a turning point for loosing stars again as i dont have them that high yet. i also dont think it mathers if youre a vip or a non paying user.