Israel is not incredibly rich but actually poorer than many European countries

You forget how poor Israel used to be. It started in 1948 with a Third-World level GDP. Since then, its economic growth has been among the highest in the world -- if I remember correctly, second only to South Korea. Catching up to the level of many European countries is quite an achievement.

the population of Israel is nearly half Ashkenazi jews,

That Wikipedia article you cite says that about half of Jews are Ashkenazi Jews. Jews are only about 75% of Israel. The article also describes some errors in the data it presents. Also, there is a lot of intermarriage between Ashkenazi and other Jews, to the point that the categories described in that chart represent arbitrary designations based on partial ancestry.

Ashkenazi jews, the most intelligent ethnic group on Earth

Drawing conclusions from studies about Ashkenazi Jews to the intelligence distribution of population of Israel is a stretch. Trust me, we've got a fair share of non-geniuses around here :-)