I think it takes some courage for a registry to print the information on numbers of foals by a given sire, and the premium breakdown.
Many mare owners feel safer in following the herd to the more heavily trafficed stallions.
This hurts the stallion with the smaller number of breedings. And that perpetuates, IMO.
My aged Hanoverian mare had a 3/4 brother who was an approved Hanoverian stallion. His name was Wendehals. He stood off the beaten path of the stallion stations but because they do the mare inspections, his numbers were quite good despite not having the traffic of bettr promoted stallions.
He had 136 for type and 125 for fundamentals, according to my 2002 yearbook.