Cats Get into Everything

Does your cat have to explore everything new, moved or even the same thing?  You move the laundry basket and bam it's now something new to be explored.  You clean your apartment and find all the toys they stashed around...now they are all new toys.  I guess it doesn't take much to amuse them.  One of my cats favorite thing is the crunchy seal they put around butter or cottage cheese.   She will crunch on that thing till it is completely crunched out.

Why do we buy them toys when everyday things excite them so?