The reason Jagr wants money is because he recently took over ownership of the Kladno team. The team's arena is tiny and they lose money, so he has to put his own money into the team. While Jagr was playing for the kladno team during the lockout they had huge attendance because they were kicking ass, but they were still losing money. He knows that he NEEDS to make as much money as possible while he still has the skill to help fund hockey in Czech. He loves the game and wants to put all the money he can into that team. It is quite clear if you read a lot of the interviews during the lockout.
Jagr thinks he still can play 18+ minutes a game and wants as much money as possible, and he also wants to feel needed and wanted. That is why he is a perfect fit for the Devils. On the bruins he was just another player.. on the Devils he has become that which he always wanted, to be the #1 guy on offense. Yes he is a great team player now, but when he is confident with his situation he can become a ppg player even know at his age. So if jagr thinks he can play top line minutes and produce, why not try to get a lot of money and play top line minutes on whatever team offers it?