it would be nice if they add sort of progress system even if it's only upon failure, like with charms or refining gears system, maybe 1 skill didn't change = 1 point and every 25 points for a +1 book for example and every 50 for +2(gold)....cus being totally RNG is unfair as said above some one (which is rare, to be even considered) may get in 20 trials while another one (most common) may not see it at all even at +200-300 trials.