You asked ... "Why is it any different than the other decorations and stables and diamond house"
It's no different to those cos every one of those features also caused mass disappointment amongst players:
The diamond temple was found to only last a week...
The stable was found to only stable one dragon, so should have been called a shed!
And the Treasure dragon says 1 gold per hour till you buy it then you find it's one gold per day...
The problem is how TL markets these features, or in all honestly falsely markets them that causes so many problem.... And the market strategies they use are purely in order to mislead consumers and maximise profit