You really can't compare DIY to a vendor.
That's the same as cooking at home vs a restaurant.
I can make a mean steak, but I still enjoy going to Ruth Chris and getting a truly fantastic steak.
Cigarettes cost about 10cents each to make and sell for $8+.
$300 designer jeans cost about $8 to make.
There's an old saying "you get what you pay for" if they found a way to cut costs you should be asking yourself what inferior ingredients are they using?
Also most of your "Lamborghini" juices do not sell direct to the public, which means they actually probably make less per bottle than a MBV.
So now you ask, well why don't they just sell direct to the public then?
They have choosen to focus their time and resorses to develop high end liquid, if they had to also ship individual orders, maintain a commerce website, deal with CS, and 100 other little deals then surely that
juice quality would take a backseat.
Just my 2cents. Take it for what it's worth.