Look at the "Stickies"- threads that are always on top in a category- You should see one or two about Giveaways.
Couple of years ago, I began a giveaway here on the forum, in which I would give some wrench or tool out of my stash each week to some lucky member who had posted in that week's "Papaw's Crazy Giveaway" thread. It was a blatant attempt at growing the participation of members and attracting new members. That led to members wanting to join in the giving, so we began rotating each week.
One intention is to spread the wealth of old tools around since some of us have duplicates or items we have no need for in our stash. Another is to push each other down the slope by giving something that the winner may not have yet.
In the beginning it was me giving, then when members wanted in, we were having the winner give the next week's prize, but sometimes the winner didn't have anything to give, so we went to volunteers each week.
The current list of givers is here-
http://www.papawswrench.com/vboard/index.php?topic=3070.0