Absolutely. If you like social experiments, I could think of few that had more potential for so little risk/outlay. You might get some truly fascinating stories

Absolutely. If you like social experiments, I could think of few that had more potential for so little risk/outlay. You might get some truly fascinating stories that you could share on your blog, or you might hear one tiny nugget of information that would be worth your while. At the very least, you'd give a homeless person something truly worthwhile along with a welcome hot cup of coffee.