While not strictly about preaching, we all recognize that without the volunteer services (we prefer to call it "ministry activities") of our church family, ministry would never happen:
The value of a volunteer hour nearly kept pace with inflation during ’07, increasing 3.94% while consumer prices tracked at 4.1%. The estimate for the value of a volunteer hour jumped 74¢, from $18.77 in ’06 to $19.51 in ’07, reports the Independent Sector, a coalition of nonprofits and foundations. Volunteers play a vital role in helping America’s 1.4 million charitable organizations improve lives across the country and around the world.
–Non-Profit Times 4/17/08 via the Church Leaders Intelligence Report