I bought some things e.g.
https://marketplace.reallusion.com/hq-modern-studio-apartment-2
This apartment is ultra realistic (in the ad) but when I bought and rendered it, it is not realistic at all. 
Why is the commercial realistic ? 
Do I need another plugin or something. I think the lightning is not good. 
Some iclone things ARE realistic e.g. the iclone example apartment which is included in iclone 7.0.

Because the screenshots were rendered with Iray (it they were rendered in iClone at all). Developer neglected to mention that, nor post screenshots rendered natively in iClone.

Thank you very much! That helps a lot!

No problem. This is how it supposed to be presented (this is WIP in association with CGtrader dev btw)

76% of original size (was 664x19) - Click to enlarge

RL should really require that developers of pricey stuff show how the product looks when rendered in iClone. 

---

76% of original size (was 664x19) - Click to enlarge