The “fun” aspect was what drew me to BeOS when it was near its heyday. What that thing would do in comparison to Winbloze at the time and the user experience in general was astonishingly more pleasant.
I remember their simple web server called Diner I had a website hosted on an older machine running Diner in my lab and it was just always on and when my office got DSL I felt like a king having that site up and accessible from anywhere, knowing it was on a box in my office and running Diner on BeOS.
Just keep in mind, in such a case, that your performance will be quite reduced due to limits on I/O. When you have Linux on a real drive - especially a striped RAID, the system is blazing fast. It’s a substantial difference you should keep in mind when evaluating.