1 is sort of on the edge of being correct, and it's quite understandable, but it's not natural. The main issue is "worth you appreciating". Try "worth appreciating" or "worthy of your appreciation". I also don't like "collectible" in this context; those items may have been collectible at the time of their accession to the museum, but they aren't collectible any longer, at least from the point of "you" who are appreciating them.
2. Definitely correct, but again not 100% natural in the conversational context the examples suggest (unless you are particularly emphasizing the "not"). The contracted forms "haven't you" and "hasn't" would generally be used.