I don't tie too many flies with those delicate silk floss materials, so I personally don't understand, nor NEED a ceramic bobbin. I actually have one, and use it for keeping wire spooled.
I want a rite bobbin, but mainly as an experiment, i have heard they are damn strong per kelly galloup, and would like one for gx2 thread, where I won't bend the bobbin when spinning deer hair, etc.
I currently buy 4-5 dollar bobbins, and have tied just fine with them. I have about 6 bobbins, I want about 60 more. have every color and type of thread spooled ready to go is a great time saver.