Children skiing - a niche?

I took this snapshot last winter, and it was rejected by most agencies due to technical issues. But in those few places it as accepted, it has sold relatively well. Scanstockphotos is usually a very low earner, but this picture has sold 4 times only in January.

Cross country skiing is a very popular winter activity even for small children in Scandinavia, and competitions and races are arranged regularly. A search on Shutterstock and Istock reveals no similar pictures to this one, and a simple search on picniche gives a rating of 8500. So I guess I'll be bringing my good camera and a few more props the next time we go skiing!