My mother's favorite story. Don't know the source but I heard it thousands of times while I was growing up!:
A circuit preacher and his young son traveled the countryside on horseback. When they approached a small town the preacher would offer to preach a sermon at the small church in exchange for what the congregation could afford to pay. At one such small church, the preacher and his son entered the church and the preacher casually threw a quarter into the poor box.
After a fine sermon, one of the congregation stood and thanked the preacher and said, "We're a small church and we can afford to pay you only what's in the poor box." He opened the box and dropped the contents into the preacher's hand...a quarter. As the preacher and his son were riding away, the preacher was grumbling about the meager pay. The son listened for a bit and said "Dad, if you wanted more out, why didn't you put more in?"
We always get out of life (and volunteering) pretty much what we put into it!