rondo does not strike me about making a lot of money, and seems to really like Boston. But if the opportunity came to join another team with a better chance of winning, and to make just as much money, he be gone. Ray did it for even less money.
Loyalty is a two way street. Danny has told Rondo to his face that he likes him a lot, but if he could improve the team by trading him, he would. He traded Pierce and Garnett. Exhibit A and B.