We're an european shop as well and hats off to you for carrying an AVO of over 1k, ours is at about 700 and Ive recently (3months) done a a Mudlick mail campaign. I actually read some of your old posts while researching how effective they were on here. Ive had 4 customers so far, one had an old ass Sparta which turns out is a kit car built in the UK from a Datsun, he had a window issue and needed a window switch, I tried to wiggle out of it but he was an AF veteran (he made sure to tell me) and he was over 80 years old so I felt bad, I hunted down the switch and gave him a price of 250.00 installed.... He was shocked how expensive it was. Second customer came in for a coolant leak that his other mechanic couldn't figure out, approved everything 1600+/-, no questions asked. My most recent one actually came in yesterday. 06 CLS550 AMG that had been parked for over 6 months guys brings it in because he wants to sell it, its his second car, he mentions and exhaust noise and CEL I get to looking at the car and its apparent that it was hit hard on the right side, coincidentally the weld all the way around the body of the cat was split clean, only 5 cats left in the country for it and I give him a price of 1600 for the cat and 2 O2's. He starts asking all sorts of questions about why cant we weld it back etc etc, finally says his brother is coming to have a look, brother comes looks and customer calls me 2 hours later telling me he doesn't want to put that money into a var he's selling... The car had a massive audible exhaust leak and CEL, he took the car.
My campaign was targeted at european vehicle owners with a household income of over 50k. My opinion is that customers who look through all their spam mail at mailers/coupons are more frugal, always looking for a deal and that carries over into their cars. I personally don't think I will be running another campaign even though the new account manager at ML emails me every week to approve the artwork that I never requested.