True, but insurance companies know how to measure and charge for risk.Mitigate does not equate remove.
I think the demise of the DIY MC garages is one of cost and a small potential market to start with.
I can see the cost of opening then running such a business to be way beyond the expected revenue; even the most optimistic revenue projections pairing it with a good coffee shop experience. There just isn't enough condo dwelling MC owners who are either interested in or capable of doing their own work, or ones who have an old enough bike that would require much work.
For one to exist for any term I think it would need to be a "passion play" kind of business where the owner REALLY, REALLY loves the concept and execution and is willing to accept the work load and financial return. He'd also need either a favorable lease or to own the building outright.