hypocrisy - Behavior that is the opposite of how one actually is, being fake by pretending to be one thing, and acting in the opposite way.

The politician was guilty of hypocrisy because he promised reforms, but his real goal was to enrich himself and his friends.
negligible - So small or unimportant that it can be ignored or doesn't have a noticeable effect; insignificant in amount, size, or impact — too minor to be worth considering.

The difference in price was negligible, so she bought with the higher-quality option.