Ephesians 4:11-12 suggests that ministers are given by God as gifts to the body of Christ. 
When I visit a church for the first time, I pay close attention to how the people treat their pastors.  Because how they unwrap the gift God has given to them provides me with great clues about what kind of people they are.

Put it this way.  When I go all out to find the perfect Mother’s Day item for Holly, I wait with great anticipation to see her expression when she opens the box.  All of the effort is worth it if she responds with gratitude and delight.
If her reaction is cold and indifferent, I’m less likely to go all out next time.

Certainly, God feels the same way about the gifts He’s given to His children.  When we receive the people God has placed in our lives with appreciation (not just our leaders, but everybody), it satisfies His heart.  When we’re negligent to demonstrate our thankfulness, it could possibly block the flow of future blessings.  That’s why I am so diligent to honor and bless my mentors.  I want to unwrap the gifts God has given in a way that lets God know His generosity is not wasted on me.