They are gorgeous table decorations and great if you don't have much space or want a table center piece.
There are different kinds of ceramic Christmas trees that are collectibles, including the vintage style ceramic Christmas tree that are often antique collector's items.
And then there are the popular branded ceramic trees like this Disney Tabletop Christmas Tree: The Wonderful World of Disney by The Bradford Exchange.
For more in depth information on collecting these you can check out the blog:
Ceramic Christmas Tree With Lights
For Collectible Types see: 8 Types of Ceramic christmas tree with lights
The blog also covers the following topics:
How to choose a base for a ceramic Christmas tree when repairing it; 5 Tips for a base for your ceramic Christmas tree with lights
Where to source the right lights for the ceramic trees; 3 tips for sourcing ceramic Christmas tree lights
Things to watch out for when getting one; 3 musts for a ceramic Christmas tree with lights
Lastly, there's a quite important article on the dangers of these trees to be aware of if you have little kids so do check out; 3 Warnings about ceramic Christmas tree with lights
Enjoy!