Web development had increasingly felt like a treadmill, but with added bonuses of decreasing budgets and growing competition. I love travelling, and the photography aspect has been great complement to that. Good excuse to get away from a desk as well.
So far this year I've been paid well to go on two $15k pp cruises, and paid to go on Australia's most famous train trip. My wife is a photographer and has joined me on two of these. I had a job for all of last week filming whales with a drone. If I don't have work lined up, I usually plan a trip camping with my kids and then sell the content afterwards to the state tourism authority, regional tourism authorities, local operators (accommodation, tours, etc), etc. I can't recall a trip in the last couple of years that hasn't paid for itself.
It's funny, but I realised at some point that I was doing things in this enterprise which are always pushed in the startup community - do things that don't scale, talk to your customers, etc. I don't do those things with my other side hustles, but I have done them with this and they've worked. Must be that they come naturally when you have a strong interest/passion for something.