It's a very important question. IMO we should be most mindful of our work and moneymaking since we spend most of our waking life doing these things.

When we are dishonest in our moneymaking, we are probably creating unnecessary suffering for others. That's enough reason for some.

IMO it also feels easier to love and be loved (e.g. by friends, family, your children, etc.) if you are honest in your dealings with others.