I looked up "collectible" at m-w.com. I can see two senses where the word is useful:
1) You're in the billing department of your company, and a bill has become payable. "Hello, client? I want money. Your April bill is COLLECTIBLE."
2) You're rolling a lump around, trying to gain the favor of your father who has knocked the stars out of the sky while drinking last night. "Wow, my lump needs to be another two meters in diameter before I can roll over that cow. There's no way it's COLLECTIBLE yet."
There seems to be some use having to do with dolls or card games that I can't wrap my head around.
"I'd like a deck of that COLLECTIBLE card game, please."
"That game over there that people buy in quantity."
"Kid, the last guy just bought Uno, Uno Deluxe, and Barbie Uno. He has SpongeBob SquarePants Uno and Uno H2O at home. Is that what you're talking about?"