"I only get one cel of each of my favorite 
characters so it's like a collection of things 
that I can simply call MINE. It is very 
vampiric"

You shouldn't collect cels for the purpose of 
possessing an authoritative hold on these items, 
like the way you feel now(so you can simply call 
them YOURS). Instead, collecting any item should 
make you feel good, brings joy evertime you look 
at it, holds unforgivable memories, and it will 
make you fell more in love over time. 

If you continue to question yourself about why 
you collect cels, and let those cels' real 
purpose go to waste, I suggest you stop 
collecting, and find a new hobby that will make 
you happy, where you don't question your pursue 
of that hobby.