I am astounded by the simplistic arguments...
Scammed or not being scammed...
How could you being not scam if you purchase gear and plug them in the wall thinking that all is good, looking at the price sheet and waiting for the next upgrade?
How could you be scam if you learn how to embed any piece of gear, with no costly "tweaks", but with a method of listenings experiments and low cost devices?
When all is well done upgrades become not superfluous but way less attractive...This is the SIGN of success...
Anything can be a scam or a useful piece, it is relative of what you will do with it...
There is no fine line separating COMPLETELY beautiful and ugly faces....
I can change the sound of any room with a straw well located , is it a scam?
No, Helmholtz science ...