Being able to win in the long term in sports betting can be said that a person has gambling skills, because sports gambling will always require analysis of each match. Being able to win one or two matches can be said that a person is lucky, but if the wins are obtained consecutively, it is certain that he has special skills to analyze which team he will choose to bet on.
Skills in gambling is very essential and helps a lot to maintain a wining record, I agree with you that winning consecutively is an art of a skilled person and only when the person is just lucky that they actually get to win a few times and we consider it just lick because a result that can not be repeated is considered luck and that which is repeated is considered skill.
I don't see it actually as any sort of special skill to win consecutively because sometimes some people gamble and get lucky consecutively playing safe possibly with very low odds but then it's not a guarantee, definitely one day you may lose and yes in gambling loosing is part of the game and will definitely come up some day.