I totaly agree, people should be very carefull about choosing a tuner and there is not too many people i`d trust to tune my cars thats one of the reasons for wanting to buy my own.

You would want someone with extensive knowledge in your partictular ecu brand/carb type and engine config. And have large database of customers dyno files to prove it.

As you say, all this does make it hard to build a client base.

The dynos are about $75,000 if thats what you were asking. but i want to buy some In Cylinder Presure Transducers and software which adds about $10,000. These are for measuring in cyl presures when under load and shown on a graph showing pressure
during each degree off engine rotation. This allows for very accurate timing and fueling adjustments and shows up unstable combustion well before detonation starts.
It also plots exact BMEP/HP of each cyl tested.