This is a GREAT idea and I believe it would work really well, if it could have been made into an "Event" for a period of time.
Sort of like the forum contest, (which roll on and on, the give away wouldn't need to go near that long)
One thread,
Set a time frame (maybe a couple of weeks)
Give it a place on the forum with some notices up in the major areas of the forum.
I've seen this don't on a motorcycle forum as an annual event and the members even looked forward to it.
What was good about the "ONE" thread was it becomes more like a LARGE community yard sale rather than just a lone one family on the corner yard sale, each inspires the other and each gets to see the replies when the items gets received.
But my like of social skills and my hillbilly ways couldn't get in done here.

I'm a really bad sells person.
Oh well, its still good to see people inspired by generosity.
Good deeds like this will ALWAYS come back to us!
Mark