Two reasons, its how I was raised, and its repaying all of the good that I received here from the good folks that congregate in the C&V Forum. My parents, and the other adults around our neighborhood always taught us that if someone is in need, and you have what will get them going, you give it to them and don't worry about payment. If they do pay you eventually, that is your decision as to whether you keep it or pass it on to a worthy charity. Really saw this in the dirt biking community, as a teenager, in the early-mid 70's.
The good I receive here is not only material things, its also the knowledge and support that comes from most folks here. I try to return these, and to treat others the way I want to be treated. What goes around, comes around, I suppose.
Bill
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Semper Fi, USMC, 1975-1977
I Can Do All Things Through Him, Who Gives Me Strength. Philippians 4:13