And why everyone take for granted the legends about that place are true and right anyway? If there were male channellers loose there on a large scale, there would be a Breaking.

That Island may as well not exist. Only people who bought the BWB and read it all and hardcore fans of WOT know of it. For the millions of casual WOT readers the IOMM has never even been mentionned in the series.

When will people understand it's only an inside joke on Australia RJ included in the world map on the BWB?

After they reach the last page of AMOL and it still hasn't been mentionned, I guess...