This is my train of thought....
This pic is 10 pieces of gold that I have detected myself using a GPX5000 and the 8" commander coil. As you can see the average weight is just 0.057g. I never detected a single piece of gold until I bought the 5000. A gold bug pro, a GMT, a Gold Bug II, a Fisher F5 a chinese GC1038, a chinese fake Gold Bug Pro will all detect these pieces. The ATX I tested did not (and didn't detect the 0.17g piece I also put under it).
I bought a 5000 because it would pick up these sub grain pieces, AND be quiet whilst doing it, most of these bits would be found by a Dave Johnson VLF but you'll also be finding a lot of rocks!
This represents (to me) at least half a gram of gold that would remain in the ground if I hadn't gone for the big gun. Price of entry is high yes, but so is the price of entry to most other mansports - have a look at motorcycles, 4wdriving, photography, surfing, spearfishing, fishing etc etc etc.
I have no problem with folks persevering with the older tech or cheaper options, it leaves gold in the ground for me to find!
A 5000 is a turn on and go machine. The only thing I ever change is the RX Gain and the Stabiliser. Hardly a difficult proposition - and my first piece of gold ever with it was found on the FP setting, ie as it is when you get it out of the box (Special on front cap for Fine Gold)