The sculptures go through a rigorous selection process. There's the open call request for qualifications, then shortlisted stage 2 proposals (renderings, site plans, maquettes, presentations)  etc. All overseen and presented before experts (architects, city planners, artists, other experts, etc.) It is a very long, professional process. 

Is 'expertise' elite? Sure. Would you want your car made by non-professionals, or have your surgery done by a committee of amateurs overseeing it? 

Also: many of the sculptures have been fabricated in Calgary. A 500K sculpture injects 300K+ back into the local econonomy (welders, steel workers, engineers, shipping, installers etc etc.).  

And finally, it makes the media. Calgary & it's culture are being talked about around the world. 
www.nu4ya.com