Does good or bad luck exist?
No, they don’t exist.
As we begin the “study” of the self, and observe our mind and how our interpretations of the world are heavily affected by our conditioning, then we will perceive how what we call “Life” and what we call “I” are heavily intertwined in such manner that those “two” apparently separated entities are one.
When there is an observer (I) separated from that which is observed, then apparently there is someone operating out of his own volition. It is that collective “illusion” the one governing our general perception of the world.
Sentient beings (humans, animals, plants, minerals, etc) are agents of change just like cells of the human body. The “illusion” is that every cell has a “free will” to act, when in fact; their activity is in unison acting through the laws of cause and effect.
What we call “good” or “bad” luck are merely shallow perceptions based on what is apparently convenient for what we call the “I.” However, there is a gross ignorance of what lies beyond the surface. In fact, we label happenings as “luck,” when we do not know the causes underneath, that is the label “luck” hides our sheer ignorance.
How could there be “luck” in a world of duality which changes through cause and effect? Consequences and repercussions go beyond what we could perceive on the surface.
Observe your own lifetime. Observe the “decisions” we thought were “beneficial” for “ourselves” at first sight. Many times they will come true, but many times they will not. Throw the dice. Why is that?
There is a plot already happening which many times we label as “destiny,” “God,” “luck,” “fate,” “doom,” etc. Labels do not matter, what matters is to be able to observe without bias, prejudices, reasons, beliefs or expectations.