dude, the energy you use to spin your staff, the 'work' is the product of force and distance. by using a weighted end, you increase the amount of force needed to spin the staff. a longer twirling staff will have a greater distance, so that too requires more work to spin - hence no need for added weighted ends when there is so much more distance.
in my experience, spinning a matchstick is usually an ungraceful show of speed. ("Faster! with less control!") A rule of thumb that has remained true for me over the years is that a heavier toy will teach you clean planes, as the heavier mass will provide more momentum with which to remain consistent, fluid. I learnt on a 1.4m long, 32mm gauge pine broom handle.
congrats on choosing staff! there is much joy if staff.
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