$10 Million but you can never change a decision you've made.

A mysterious stranger offers you $10M in exchange for making all future choices magically permanent. From the time you accept the money, every decision you make, big or small, is irrevocable.

If you order something at a restaurant, you must always order that exact thing in exactly the same way each time you go. If it's a chain restaurant, this is true for all restaurants in the same franchise.

If you say someone can spend the night at your home, they can spend the night there whenever they want in the future. If you say someone can't come over, they can never come over to your home again.

If you choose to wear a t-shirt and jeans on a Monday, every Monday you must wear that same outfit. If the clothes are lost or destroyed, you must do your best to acquire an identical set or the absolute closest version to it.

This even applies to emotional things like saying "I love you" to someone in a romantic way (the supernatural force creating this effect can tell your intent). Once you've said it, you'll be in love with that person forever.

You must verbalize, type, or write an answer for it to be locked in, just thinking it doesn't count. The supernatural force will not try to twist your words and will understand and enforce your intent, so just misspeaking or committing a typo won't count against you. You are allowed to refuse to answer a question, but you are then locked in to never answering that question in the future.