Collectors either don’t practice or practice less than the traditional practitioner.  Their primary focus is in collecting things of a particular type; such as strictly keys,things relating to water, or say, ghosts.  The greater the unification of the collection, the greater the collector, with larger & more coherent collections opening up the ability of each item in the collection; their abilities as a ‘practitioner’ tend to involve being a toolbox, with items for various purposes.  Their focus is often in establishing deals or conquering Others to establish a steady supply of new items.