Customer Ratings and Lightroom

I was reading "Worth Every Penny" by Sarah Petty and Erin Verbeck and they were talking about economist Vilfredo Pareto's 80-20 rule which says 80% of effects comes from 20% of the causes.  In other words, 20% of your customers will give you 80% of your business.  The authors go on to say that if you treat those top 20% of clients better, your business will increase or expand with less effort than if you had spent all your time equally with everyone.  How do you keep track of those people?  Well, you would need some kind of database.  Because I am a photographer, I've been recently learning and studying the uses of Lightroom 3, and realized that this would be the perfect way to rate clients.  Each photo can be rated from 1 to 5 stars, and can also be rated by assigning them 5 colors, or both, although either should be enough.  But you could break things down even more by using both.  You can also use keywords and metadata, including address, notes, etc. for each person.  And perhaps best of all, you'll have a photo to go with their name, and pictures of their family should you need that.  So how do you set this all up?  What I will be doing is creating a separate "Clients Rating" folder, so as not to confuse the star ratings there with the star ratings of best photos, and putting one copy of their best photo in that folder.  And then make a keyword that would just apply to my best clients, next best, and so on.  I'm sure that as I am doing this, I will refine things more, but this gives a rough outline of the steps.

The following would be a top 20 client, shot with film and scanned.