They're purely ornamental, we never handle them, we coax them about with a paintbrush if we need to move them, far to dangerous
She can sell surplus stick insects, we've got Giant spineys, and sell them to the local pet shops for between £2.50 and £3 each, just wait till they're about 3" long, they don't survive the stress well if they're much smaller, my daughter started with a male and a female when she was about 12 and now she probably makes about £500 a year from them, there's a huge market for them because they're so easy to keep, it great because they become little business women, I know rosemary gets on average 50p more per insect than we do because she needs the money being a student.
Other things that are good that have marketable value are Malaysian hissing cockroaches, they're veggie and just eat kitchen peelings, as are giant millipedes but I've never managed to breed them, can't stop the roaches breeding, but it's ok I feed the surplus to the spiders
We've just ordered some praying mantis babies, going to give them a go