There is benefit even from a DBN (Drive-By Noob) who comes in, does his research, and buys one Sub or PO before never logging in again. Every time that happens, it increases slightly the worldwide demand for quality reps from reputable dealers, and decreases the demand for Canal Street garbage. Obviously, it would be preferable to us for them to stick around and contribute to the community, but ya can't always get what ya want.
Let's not look at DBNs as a total loss, as each one is a small victory.
On a totally unrelated note; yesterday, I saw that one of the commenters on the website of the San Francisco Chronicle (sfgate.com) uses the walrus/bucket photo as her avatar.