The Archon paintball hopper can feed 11.6 bps without any kind of motor, and without any batteries!  The only thing this hopper needs is gravity.  No electronics, no cost of batteries, this hopper's strength is in it's simplicity.

This hopper holds 200 rounds and has dual feed ramps that allow the paintballs to feed faster (than regular gravity fed hoppers) into your paintball gun.

Archon Tacamo Paintball Hoppers for sale on eBay