Do you get the concept?

[crash]

So I don't really know about conceptual art.

No, actually, you do. From what you have written, you understand the concept of conceptual art as a whole, but you may not understand or appreciate some if the concepts of individual pieces.

I think that is similar for a lot of people, and what brings conceptual art into its own. As for the guy with the urinals, well, there'll always be those special people who want to jump on the latest trend bandwagon; you could sell them air pockets, if you made it trendy first.