Thanks for your reply. I have started to think that following your passion leads to never making a profit.

I have made & shipped some very popular things - they were my passions but not built to make money. Perhaps I should look at ways to monetize these things.

I'm pleased with their success as they have helped a lot of people, however it was all set up out of my own pocket and I'm still paying to keep them running.

I'm just worried that if I follow my passions again, it'll just be another expense that I pay for.

I'm at a point where my next idea really does need to at least sustain itself. If I built something that could be my full time income - if it's providing value, no matter the industry it's in, that would become my passion.