Ok, let me summarize this:

This building takes 12 x 11 space
It costs (from buying until level 10) $23.75 billion!

So, we would expect an insane payout.
Turns out that the building is type B, so with a lot of building bonuses you might get paid $30-35 million at level 10 every 12 hours. Look, it's not the worst building - but the lower paying building also have a lower upgrading cost price.

All together, the space it takes, the price it costs and the bad payout; are you mad GREE? You wot m8? You want some? Are you actually laughing your ass off now? Is this a late April fools joke?