I have just 11 MFB, so as long as its free play, I use 100% of my parts.
When it comes to tournament usage, I use just 30-40% of things. This is because I own mostly outclassed parts. At the same time, I also hate to use painted Metal Wheels.
I have 8 Plastics and 1 HMS as well. Well, of course I use 100% of my HMS collection.
In Plastics, I use nothing because-
I have 6 right-spinning beys, and I don't have a right-spin plastic launcher at the moment.
I have two left-spinning beys- Dragoon V2 and White Gabriel G.
I have decided to keep Dragoon V2 unused as far as possible(and I have succeeded in my attempt until now).
White Gabriel G is reserved for trade, so I haven't used it since a very long time. At the same time, I hated using EG beys because they used to split apart more often than other Plastic beys. Moreover, White Gabriel used to split apart even more frequently because of the recoil it suffered due to its Free-Spinning SAR...
Team IB Revolutions
Thanks to N0body for the avatar and Synth for the signature!