I think $187/day per car is a flawed business model
Lets say 5 hoists (so a reasonable shop size) $930/day, and that is absolute income with everyone doing an overnight as well. So realistically it'll be less, far less.
Rent, insurance, initial fit out, repairs/downtime, staff cost to man the joint... You'd take 5-7 years before you come close to getting your money back as you are not selling anything or have any supplemental income.
Ok if you already owned the premises or something.
Location is a major issue i think for most - and anywhere half central in Vic will cost you half an arsehole