I for one would much rather see a stud made a gelding with the ol' knife and emasculator method than have his owner not able to afford to take him to a vet to do it. There are way too many stallions out there now.
What is different between bulls, rams, bucks, or stallions? They are still animals that can feel pain, yet I don't know anyone that has a vet out to castrate bulls, or dehorn them with a gouger etc. If you feel its ok to slaughter and eat horses, and to consider them livestock, then by all means they should be able to be castrated like them. Just food for thought.
Spent a whole hour today laying in a pasture, waiting for a sparkling vampire to show up. Alas, I woke up and looked over, only to find a mound of horse crap. Sigh.