paid to witness?

I was listening to Ray Comforts sermon titled How to Get on Fire for God. One question he brings up is "what if you were offered $1000 to witness to someone for Christ". Garanteed someone would wintess like it was going out of style. You would hear people witnessing all the time. However God has given us something much more valuable than $1000. He has given us eternity in heaven. If that isn't payment enough then I don't know what is. This charges me to put more importance of the things of Christ.