Sounds like an Obama operative, SCHIP astroturfer, "cognitive infiltrator." The purpose of the question is to induce Big Brother fear into normal buy/sell/trade activity, causing members to question themselves and their activities:

"Gee, should I be charging tax? Do I need some sort of gummint-approved licensing? Will gubmint agents, who already monitor yard sales/church bazaars/Craig's list come looking for... ME?"

It's all a plot.