One trend that gamblers always work on is luck. If there is luck then we can succeed in whatever strategy we apply and if luck does not favor us then no matter how hard we try we will not be able to turn it back. But we cannot ignore strategy completely. Strategy puts a gambler ahead of winning but cannot guarantee winning. If a gambler is an experienced person then I would say that he will be successful in gambling as well as using different strategies. Although every gambler believes that luck is an important factor in gambling.
Luck in gambling is when you try all the available options and that particular one you did really won for you, there are many other options that you can try as well and win but that works better for you and you are lucky champ for that and all this happens because we don't really know what will be the outcome, we just try the closest possibility as possible and if it goes as we expected, our predicted is justify and if it doesn't, then you are not lucky for that day.
However, luck doesn't excel well without the combination of skills, the people that won in gambling most of the time are people that are very skillful in that possibility options, they are very knowledgeable with what they can do to get the possibility as possible and the ones to avoid and this is subjective to sport gambling. Casino gambling luck depend on how the house want you to have luck, your luck is determined by how the house is hedge.