What research have you done to see where your demographic hangs out? If they are on Facebook, you know that the PPC in the social media realm can be very targeted--saving you a lot in unnecessary PPC.
Where else do your customers frequent? If they are reading the Robb Report, then an investment there may prove quite profitable. Then again, it's not exactly cheap to advertise with them.
Also, find a PR company to help you get out some publicity for your company. Send out an announcement to some regional or national exposure publications. Perhaps some of the personal finance magazines would entertain having you as an editorial advertiser. This means you get a write-up along with an ad, and sometimes that can be economical.
Ultimately it will still come down to what your budget and marketing plan entails. If you have funding for marketing, then it just needs to be a targeted investment. If you want to do A/B testing, then approach it with smaller budgets and immediately dig into where you get the best response until you find another channel you can find more convertible leads from.
Question added to topic Marketing • March 29, 2010
What's the most efficient way to market to high-income customers?
I'm starting an automotive consulting company that pairs individuals with cars that fit their needs, budget and personality. After a vehicle is decided upon we find the car on the dealer's lot, conduct or schedule a test drive and negotiate the vehicle price and financing terms in order to save our clients time, hassle and money.