No doubt weight of numbers plays a big part but

Bettor’s Delight was the leading stakemoney sire in North America for the eighth time in the last 11 seasons, the last four on end. During the closing season his stock earned $21,618,449, more than $1.6 million ahead of Somebeachsomewhere in second position.

Next on the list was Somebeach’s son Captaintreacherous, followed by American Ideal, Sweet Lou, Art Major and Mach Three.

https://www.thetrots.com.au/news/art...d-states-sire/