I am doing my panos mostly when I am travelling, I don´t do it professionally. A thing that I would like to be able is create like a little "travel blog" or album for example for a hike I did. Meaning I have a start point where I start doing panos and explain stuff, talk about the surroundings and then do panos throughout the hike until the goal. so you basicacally do a travel guide for people who are looking for a walk somewhere, cool would be if you even could create a specific path on the map, so people could choose a walk path and get explanations throughout the walk, for example with the help of wikipedia.
I am not sure how much of that is included in the pro account, but serving as a travel guide could maybe be an interesting market.