Why put a fake anything in...anything?
If you are going to spend $150 on a crappy 1/1 scale of something, why a sculpture of a tree? Why not a rocket ship or a naked lady?
Seriously, fake trees are about the tackiest thing I can imagine. Worse than giant wings on the truck decks of Civics, or clip-on ties, worse than Pamela Andersons tits, worse than a light up velvet painting of Jesus standing next to George W Bush.
If you live someplace where real trees are too expensive, or you are allergic to them, then just find some other way to decorate.
I can only think of one thing tackier than a fake tree: those plastic scrotums that truck people hang from their trailer hitches. True story, I saw one of those hanging from a C5 Vette this summer...and it was being driven by a woman.