Am I allowed to publish a 3d scan of a statue/thing I bought? I bought a buddha statue and I would like to scan it using photogrammetry and publish the result. 

Am I allowed to do that?

Is this the same like scanning a book and publishing it? Sketchfab on the other hand is full of 3d models of commercial products.
If the design was made from an artist and is not public domain, than you should not upload that scan without the (written) permission of the creator of the design. Espacially a scan of a decorative object will likely be protected, so costumers buy the original instead of printing itself or buy a printed version. If you would design a deco object and sell copies of it, you also don't want that others just scan it and print it.