Marcomo,
My post was mean't as a bit of lighthearted banter.....i have also used metered machines.
However,what i will say is this.....the most profitable way in terms of detecting is,as we all know,if we dig every single target in a given area.....that way you do not miss a thing.This takes time and extreme dedication,i know because i have tried it and most people haven't the time and some of us the energy to hunt like this.
Everything you add to the equation after this (digging all signals),such as tone or vid will help you to start missing decent targets.Vid's are not very accurate at all and can give many different readings on the same object depending on many factors,so if a person uses vdi as their main form of identifying targets,their success will be very limited.
Tone id is far more accurate than vid but it can still be influenced by by prevailing ground conditions,depth of target etc......so even this will miss you targets.....i have done many tests on actual buried targets compared to in "air tones and vid" and have come to realise just how innacurate such detectors can be if you don't want to miss anything at all of value.
So as you say,and you are correct,if you don't mind missing certain things for less trash digging,then a metered/tone machine is an effective tool.If you have more time and stamina,cutting out minimum ferous and digging everything,even iffy signals is still the way to go for maximum results.