(I was going to call this “luck”.)
There seems to be something in us that is hungry for chance, irrational as it is. We understand when we see something totally random—if we didn’t in our ancient past, we do now in the age of Expected Value—and we don’t expect to profit from it.
Nevertheless we will eagerly give some degree of control of our lives over to it. We are happy to; sometimes we’re relieved to.