I agree. Your own hobbies and interests can be the catalyst for a great product idea. It’s highly likely many other people also share your passion and need the same items you do, whether that be art or a collectible, craft tools, or essential piece of equipment, such as a snorkel, bird watching binoculars, baseball bat, and so on. Not only are most hobbyists prepared to spend to support their interest, but you as a seller will already have a lot of knowledge about the product, which will make sourcing items and marketing a lot easier. Sometimes, friends and family can be the source of an idea. Perhaps they are all having the same trouble finding the perfect baby carrier, ergonomic gardening tools, or kitchen grill. Just 3 or 4 people looking for the same thing can indicate an opportunity waiting to be grabbed.
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All the best!