Scene management trick?

Hi all!!

Im creating a big project with Unity and im getting to a point where im needing to learn database management load/save etc when changing between scenes.

But i "found" some weird way to never have to load scenes and to fake that so objects get never destroyed.

Let say i have a world map and i want to enter a shop buy scene when i clik on something.

I created a Empty Game Object with a child containing the world map objects etc and a Empty Game Object with a child containing shop objects.

What if i disable World map container and enable shop container, and when i turn back to world map i enable back the world map and disable the store?

And lets say that as i have a shop i have an armory, a fort, a battle scene etc and i want to use this "system(?" also with theese scenes. Always having one active.

Is this CPU expensive?

J