Lucre (noun)

1. Money or financial gain, especially when considered to be the only or main motivation for an action.
2. Profit or wealth, especially when it is considered to be the only or main motivation for an action.

Origin:

From the latin word "lucrum" meaning gain or profit.

Examples:

1. He was motivated by lucre rather than a sense of duty.
2. The businessman was only interested in the lucre of the deal.
3. She rejected the job offer because it was based on lucre not passion.
4. The politician was accused of being motivated by lucre.
5. The artist refused to sell out for lucre.