That or someone running some sort of scam or asking for money. All on the same continuum I guess. I'm always on my guard when a talkative stranger approaches me. Which is sad in a way, but experience proves it's necessary.

You may be shaping the samples you collect in a priors confirming manner.

I'm in my 42nd year of life and I've never been small talked into giving someone money. I have been accosted by pan handlers who are directly asking for money. But never under the guise of a conversation. Ok, I take it back, once in 2011.

Depends on the MLM penetration in your community, some (Amway being a big one) recruits strangers in public.