Do car registration fees scale with car value in your area?

Kinda… it’s based on the age of the car and the original MSRP, so it isn’t exactly based on the car’s actual value, but an estimate of what the value might be.

https://www.in.gov/bmv/fees-taxes/vehicle-registration-fees-and-taxes/excise-tax-information/#Passenger_Vehicle_Excise_Tax_Fees