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Hi Guy,
My take on it fwiw? A collector will buy and try and then if not for them, move it on again -- or if it is for them sometimes move something else on instead, as imho, any collection of anything is organic and constantly evolving which is what categorises a collector who collects ...
A collector does not own a collection (ergo a collection considered complete by its custodian), as then they would be the owners of a collection, not be a collector per-say.
Someone who needs categorising as a dealer on the other hand (again imho) is someone who buys something solely with the pure intent of moving it on for profit ...