Well, there is no statistical difference in beginner gambling versus an experienced person gambling, a beginner's emotions might actually be more stimulated as he hasn't got the gambling experience before in his life.
If you are not playing at a provably fair casino it is entirely possible that they "bait" the beginners into playing more.
If you are a person who is always basing on your luck then you will probably believe on this saying that beginners has always the luck. They might be the luckiest for their first try but this is just happening to very few people. But there new comers to gambling who are not become lucky too, maybe it is truly a luck based experience.