ETFs by volume

Thinkorswim has an watchlist that contains about 1500 ETFs. I graphed them by volume.

The first chart is the top 20 ETFs by volume today. Some familiar favorites on the list. For some reason the 3x funds aren't included although FAS and FAZ do a lot of volume.

Even in the top 20 there is a fat tail.
Gets even worse when all 1500 are included.

Liquidity brings in liquidity.