In the mortgage industry, I've seen clients get better rates from other lenders and switch to them, only to regret it later. I've seen clients who don't care about interest rates at all—they just want to make sure they're getting the best deal possible. But the best clients are those who value relationships more than short-term material gains.
I found such a dream client last week. After accepting an offer from a vendor, this client got a better rate from another lender. But he refused to take it because he valued his relationship with his existing vendor. He didn't even care about interest rates—he wanted to make sure that he was working with people he could count on! He valued our relationship more than the extra few bucks per month on his mortgage payment. That's integrity! I'm glad I could make that connection with my client.