For everyone scratching their heads about how to make a profit in the modern world, my advice would be to turn the old acting axiom - "never work with animals and children" - on its head.
As a parent in a highly commercialised age, I say that the smartest thing you can do is find a kid or animal-friendly niche, and work it for all it's worth.
All kid and animal businesses are potentially lucrative, but let's be honest: the parents who will spend a week's wages on a birthday party are the best bet. And on the animal front, at this moment someone clever is probably working on a million-dollar idea for a pet hospice with adjoining counselling services for bereaved owners of cancer-stricken labradoodles.
I don't have a pet, but I do have three children, one of whom has just had a birthday party, and oh, let me recount the ways a soft parent is steadily relieved of her cash at the sight of her darling's round, imploring, soon-to-be-the-next-age eyes. My daughter is at that age when all things pink and fairy-like appeal. There's a shop in Auckland crammed to the gunnels with highly priced fairy paraphernalia which also offers fairy parties hosted by "real" fairies armed with fairy dust and fairy gifts that seek to make little girls' fantasies come true. (A particularly busty, pretty fairy who was once hired to come to the house to entertain the kids for 45 minutes probably helped make a few of the fathers' fantasy lives richer as well).