The concept has been floating around for a little bit in Canada now but it's definitely not mainstream. Because it's almost impossible to calculate an exact number you are definitely fighting an uphill battle. The actual diminished value fluctuates significantly depending on A) when you sell your car and B) if the new owner cares. I don't know that I would bother putting a lot of effort or resources into this project unless you had a rare / valuable car that something like this made a huge difference. What's your vehicle?
Is there the odd company that will cough up some PFO money just to get you to leave them alone? Maybe. Is it standard practices? Hellz no!
"Masked Bandit is a gateway drug for frugal spending." - Unknown303