Osteogenesis imperfecta (OI) is a group of genetic diseases of collagen in which the bones are formed improperly, making them fragile and prone to breaking.
The cost to install drywall is about $1.50 per square foot. After material and labor are added in, the cost per panel can range from around $40.00 to $60.00. A typical 12x12 room, for example, will use 12 panels.
Without starting a moaning/groaning contest it seems anywhere from $1 to $1.50 per sq foot of drywall is a legitimate rate (to finish only) for someone that has a real business, pays workman's comp, has liability insurance, and allows for profit to help his/her company grow.