My take on the matter.

As much as I'd to agree that a pro gambler doesn't rely on luck, I'd have to disagree. Any and all gambler needs luck. You might have the best analysis and formulate a strategy around it but if the luck isn't on your side that day, you're thoroughly cooked.

Not doing in depth analysis only increases your chances of getting cooked more often whereas a pro survives for longer because those analysis reduces the reliance on luck but luck itself never truly go away.