Do any of your players like another players signature throw more than their own?
There are some players who just like to switch it up. A signature yoyo can be more than just what you choose to use in competition. Competition calls for a certain style of yoyo to play a certain way. A player may have a different style but need a competition focused yoyo to use in competition or vice versa if their yoyo is competition focused and they just like to play around with something more fun off stage.