A "relationship" is more about a mere transaction of services for dollars. It's a deeper symbiotic arrangement where both parties benefit mutually at a deeper level. It means that you are more patient and sensitive to the client's needs. It means that they are more patient with you when things go wrong. (and sooner or later they always do) It means that they don't dump you the moment someone cheaper or flashier comes along. It means that you don't raise your rates as aggressively as you would for a less-close client. It means you take their call at hours you might not take others. It means you don't charge for every phone call or nugget of advice. It's mutual respect for what each offers the relationship.

I am happy that I have many "relationships" whereas many of my peers have mere "jobs". Some of these relationships have lasted longer than most people's marriages.