Alright, why is it you're willing to, essentially, take money from someone else's pocket?
I can't say for sure, but I assume there are some dealerships that work on commission. If that is true your kindness of giving bottom line pricing may reduce the pay the salesman/dealership takes in. Maybe that dealership needs to make 10% profit to keep the doors open and now has to raise shop rates to close the gap. I mean the point of having a dealership as a business is to make a profit.
Not saying I don't like your approach. Just saying you might be making enemies at the same time while gaining no business of your own.