Israel is adjacent to an incredibly strategic shipping location - the Suez Canal. The Suez Canal links the Mediterranean to the Indian Ocean without having to go around Africa or around Siberia.
Israel isn't strategically important because it has big oil reserves. It's strategically important because it's near a lot of important things. Oil and shipping play a bigger role than you'd think.
If you're worried about the cost, have you looked into getting it through your library? That's how I did it.