I only attempt to sell my pens on the approach to Xmas, and income will depend on venue, was it well-advertised, weather, and how much money is about. I wouldn't even attempt to estimate my potential income. Two years ago I took £900 in just three sales. This year so far, it's been bloody dismal! My view is simply to hope to recover your costs - everything else is a bonus - including the pure pleasure of turning pens!!!
Bob.