The did indeed get executed, or flee. I don't know that many transformed to communism because the Communists executed all they could find.
As to greed, those who fled took very little with them except for maybe those who fled with Empress Marie from the Crimea. They had more time to pack and brought many more of their personal things with them but still not as much as they would have liked.
What they did bring, for a while, was their Imperial attitude and they irritated each other and anyone they had to deal with in the countries they fled to. They had to learn that they were no longer the ones in charge and that, with a few exceptions, no one wanted to support a poor Romanov.
Indifference to the way society was headed may have been something else that caused the Revolution. Those who had a lot lived as though they would never lose it and that things would go on forever. It has been said that those aristocrats who wanted to remove Nicholas and Alix from the throne always thought that once the coup was over they would go back to their lavish way of life and their parties and balls and nothing else would change except for who was Tsar.