I think just one thing keeps the Tiger's appeal so strong, and it's something even a Chippy doesn't have:
It's an open cockpit biplane!
I defy anyone to fly any open cockpit biplane, no matter how poor its handling, and not to have a big grin on their face!
In a Chippy, you can play at being a Spitfire pilot. In a Tiger Moth, a Sopwith Camel pilot!
In a spam can you can recreate the heady days of driving a 1956 Ford Consul!