Dearest Clare,
Please name me one situation on a pooltable that you think involved luck, good or bad. Unless a player hangs out in dank, smelly,"poisoned air" poolrooms where rats scurry on pipes above the tables and occasionally a clumsy one falls onto the table the balls will go and stay where the player shoots them. No luck in that.
Any and all players that I know who believe in luck do not take responsibility for their own actions, on a pooltable or in life. They are always blaming something else, like luck.
While I'm at it I'll also mention that I do not believe in "good" or "bad" rolls. I'll take credit for the good things that happen when I shoot and blame for the bad things. That's why I bet my money on me and almost never on someone else.
Cowboy "unlucky in love" Dennis