You've picked a hard bunch of folk to try and sell to. ;-)
I would say the cost is the cost with this sort of thing. Getting bespoke parts made isn't going to be cheap so those willing to pay the price probably won't be many but good to see some innovation and very good of you for offering it to the guys on here. One thing you need to be certain of before you sell any is how durable they are, if the chrome chips off easily, or they crack over time, etc, people are going to be wanting they're money back which could leave you in a spot.
Now you have got one to copy these guys would make them from stainless steel for you as they have offered to do this for me in the past:
http://www.sgbumperscar.com/products(VOLVO).htm