Save it for the people that need to hear it. I put an average of 12-15 thousand miles on my oil before I change it and I use synthetic. Why don't you start a campaign to de-mystify the 3k oil change interval(which is complete bull).
Do you car pool? Do you recycle your oil? Do you keep your cars in peak running condition?
I'm not a freeloader. Go preach to someone else.