When I sell a horse, I always sell it with a halter and lead. Always. Be it a ten year old broke mare or a weanling colt, it goes with a halter and lead.
If it's a free horse, okay, I can see saying to the person to bring their own. But when I pay $5000 and then you ask me what I want to do about a halter? Yeah, that annoys me a bit. It's not a huge deal, and I'll obviously send another $40 for the halter and lead but...really?
Anyways, I'm curious. Do you sell with or without a halter?