I am sure there are many, such as your self who have helped quietly and without recognition..but you are the rare one..and everyone should be greatful you do walk the talk.
Just ask many of the rescues..especially the ones now over stocked..they can not find anyone who will adopt or donate...what they hear is: I didn't cause the problem and it is not my concern. I will look after my own horse
Some are wise not to help if it is going to cause them a problem..but they also won't help by reaching out to those they know and asking if they could donate a bag of grain.
As for large numbers of horses...most breeding farms WANT only six top producers...however they tend to have 20 to 50 in their herd. It is very hard to reduce numbers right now.