A simplified version of this that seems to work well is that the base rate and services fully meet your expectations of care at your barn. The extras are itemized.
I’m so horse poor it’s stupid. The only way I semi manage is having some fixed costs. I don’t really care about saving $15 on turnout because it rained and then plus $10 for the extra stall and then minus $2 because we dropped grain a 1/8 lb or whatever. I want to know my board rate is $X. It feels like penny pinching even if the heart of it is transparency.
When barns have openings in my area it’s a management issue not cost. Most BO are more abrasive, burnout, and angry than they realize they let on. The golden retriever BO and BMs keep a waiting list even when the care is significantly suboptimal. This is a hobby. Coming out at 5 to someone who just wants to bitch about costs and effort completely drains the experience. People will pay for the customer service of a positive and simple process. COTH tends to have a more educated audience that’s likely more willing to tolerate human frustrations for equine well being.
Provide lovely customer service, be able to channel golden retriever even after Dobby broke a fence and the farrier took an extra two hours and I bet you can charge $200 more and have a full barn.