yes it increases with realism (nowadays most are ultra realistic) and the situations they propose (often virtual reality is done to do precisely things you wouldn’t do in real life such as walking on a tiny bridge between two high rise buildings or exploring claustrophobic settings). By contrast, I don’t know anyone who’s been sick using virtual reality to ‘visit’ their next apartment currently being built at some posh estate agents. That’s why I was suggesting that I hope they choose well as basically ‘boring’ is less likely to lead to sick whilst exciting may be hard to handle for many...