Why? One reason is $$

I was telling a friend the other day that his state adopted the National Popular Vote Interstate Compact and he demurred. "We aren't a democracy and we shouldn't be," he said. Why? "My state is smaller than the really big ones. In a democracy we wouldn't matter."

I pointed out that his state has never had any presidential candidate visit in the modern era. I noted that no small states attract any attention from presidential candidates or elected presidents, with the exception of New Hampshire, a small swing state, and occasionally Nevada. 

He stuck to his guns, the way people do in this era of non-agreement on everything. 

At bottom he does not like democracy. He has his reasons.

But here is one argument in favor of democracy, even if irrefutable thinking about elemental fairness or the virtue of participation in elections doesn't grab everyone.

This paper concludes that democracy produces greater wealth for the whole society.