I love gammy hooks, and being able to use them on flies is great.
Tubes can be fun, it's easier to switch hooks than with a stinger or trailer set-up. Cost can be cheaper than using a wadington shank or cut hook. and you can make the tube as long as you want. If you do want to buck up a buck or 2 and want some weight, you can get brass tubes, I haven't played with them yet, but I know Rick has.