This sounds like someone trying to justify themselves or using an undersized sample. Since they represent a cross section of the population, I think it would be safe to say gamers as a group have no more or no less leadership skills than the rest of the population. The leadership skills of guild leaders probably measure up nicely against the skills of bowling league presidents, kids sports coaches, or choir directors. In other words, good leaders are a subset of the population and we should expect an even distribution of these leaders across all recreational activities. Applying this from the other direction I would say it is unwise to assume an individual has no leadership skills just because he/she is a gamer. The gamer has the same probability of having leadership skills as someone who gardens for a hobby.