an eye on/for/to the main chance
The continuous seeking of opportunities to advance oneself or make money. The term often refers to someone who is ambitious without consideration of others. Primarily heard in UK, Australia. You just have an eye on the main chance—you don't care if I succeed or fail.
an eye for the main chance
or an eye on the main chance
BRITISH, INFORMALIf someone has an eye for the main chance or an eye on the main chance, they are always looking for an easy opportunity to make money or to improve their situation. Are these the words of a genuine football reformer, or an opportunist with an eye for the main chance? You make your own money and luck by being out in the world with your eye on the main chance. Note: You can also say that someone looks for the main chance or takes the main chance. He was just an idle boaster looking for the main chance.