I dare say people can't be motivated to make money unless their personality is like that.
Most people want to make money (for whatever reason, to use it, to save it for the future...). If someone doesn't want to make money, that's it. I feel that making money if something that some people want (ie. to have more money), but that other people just feel comfortable with what they have.
The latter don't want to make more money either because they have enough and feel it is unnecessary, or because they can't be bothered to try. If this last one is the case, motivation may come from ease to make money. This is, if you find a way that makes earning money easy, you can show it to them, and they may like it and be motivated.