Not a fan. A dry stall is a dry stall, perhaps with turnout/in and filling of water buckets provided. Perhaps.
Because that should all be built into your pricing so that you can offer a set price to your customers. Look at a year’s worth of expenses and average it out. It’s a giant PITA, but not that hard
When I was on DIY (dry stall but with turnout and water bucket filling provided by the BO) I bought a year’s worth of hay at once. In the summer I’d use very little and in the winter I’d go through it at an almost alarming pace. It averaged out over a year to a reasonable amount per month. I would expect a barn owner to be able to do the same - make calculations for a year and average it out to a per-month cost. Same with bedding, hard feed, etc.
It would drive me absolutely bonkers to have my board bill fluctuating every month for ordinary things. About 30 years ago I was at a barn that surcharged for some pretty mundane ‘services’ and it drove me bonkers trying to figure out my board budget.
If you want to offer things that most boarders are not going to take advantage of (daily booting, more expensive feed, different type of hay, etc.) have separate monthly board rates or surcharges to your board rate that are consistent year round.
If boarders argue about monthly charges being the same year-round despite x,y, and z, you tell them the price is average over a year and takes into account fluctuating feed/hay intakes, indoor time due to weather, etc. and that you do this to make their monthly bill paying consistent year round.