For an enjoyable and informative book, try
The Middle-Class Millionaire
by Russ Alan Prince and Lewis Schiff. It's easy reading and does point out some interesting sociological observations. Pleasing the highest net worth individuals isn't going to get you the viral marketing you're looking for - target the market just below that. The Middle-Class Millionaire is much more likely to refer you to colleagues and friends.
Read the values of the Middle-Class Millionaire, and learn how they differ from the Middle Class. There are certainly enough points for you to consider who and where you want to target your marketing.
Get it from amazon.

Sharon - It is so important to know about a group before trying to market them. Sometimes there is no recovery if you start off on the wrong foot. Thanks for sharing this.
Jennifer - I've always enjoyed psychology and I've always enjoyed reading - guess this hits both passions. The author Schiff spoke at a local luxury meeting, but I was out of town (in DC actually) and unable to meet him.
Sharon Great info I will pick it up. They are our target market.
Jason & Deanna - Hope you'll enjoy it. There were some interesting points.