You Just Joined Puzzling SE. You are about to ask your first question on puzzling SE, but you face an emergency. You have the Reputation Bonus, Therefore you have 101 Reputation. You forget About Puzzling SE, and a 100 years later, your great grand child opens your account. If Stack Exchange Worked Like the real world, He/She would have found out that your rep (On Puzzling SE) has in a way decreased.
Find Out what affected your Reputation Points.
I don't know if you can lose the reputation bonus, but that's not the case.
What I mean by reputation is the value of your points, not how other people think about you and stuff...