RnG is sometimes funny.
Burned around 55 thousand normal seeds, and got 1x 4*.
Then two days ago I used around 20K seeds and got 2*4stars (both of which I already had).
Well its nice there is at least some chance for you to get 4* from normal, but strangely enough, IF I get one its always one of those I already have. Very harsh on my collector spirit :P