Persian Empire and Greece

The Greek city-states that were under the Persian Empire were miserable as Cyrus and his successors were cruel leaders. The Persians might think that Greece was a waste of time because of their geography. Greece was located at the edge of the map and was far away from Persian homeland. It was also a poor city state with nothing much to benefit from. Thus, it probably took a long time for the Persians to get to Greece and get minimal out of it. The Persians also never thought that the Greeks were strong enough to come together and rebel against them. Also, the Greeks had many things in common already with the Persians, which meant that there was not many exchanges that occurred.