I see nothing wrong with spending $800 on a set of gages.
I would spend that much on a velometer if I found one I liked so much.
Look at what is spent on combustion anaylisers!
When I started out, everyone had a Halide torch. Now ... look at what everyone is carrying for leak detection. Big bucks.
It's the same way with those gage sets. Someday the prices will drop and people will begin buying them.
But until such time as we see and hear of friends using them and making claims of how much trouble is saved by having them ... we will put them out of our thoughts.