One person in my guild did a test like this too at kokkara out of 30 times, he recorded the results and "success" never appeared on the right card out of all 30 times.
use trick..in korea i use that. if u luck, u got bonus in pattern (4-5 times success in 1 row and same in pattern). for me (30% is luck. 70% is logical/ur intelligent).
with trick, u can prevent with fail or broken. and all veteran korean players know that trick.