Pretty sure blow drying hair has very low variable costs. Electricity to run a hair dryer. Everything else is to some extent fixed (including operator). What

Pretty sure blow drying hair has very low variable costs. Electricity to run a hair dryer. Everything else is to some extent fixed (including operator). What it doesn't have is SaaS style scalability (1000 users costing the same as 1), and it's not like a yoga class where you can probably do 30 in the same space as 15, but the variable costs are just the electricity.