I understand what you are getting at, but in concert Flea uses 3 identical GK2001/4x10/1x15 stacks. If he was just mic'ing and DI ing it to the FOH, he wouldn't be using 3 of them would he?
He would if GK sponsored it and gave him 3 stacks to use at every show.
It's a marketing deal, he's doing the same thing now with Acoustic.
I used to run a 15+410 stack too, just learned since then it's not the best way to go about it. Anyway, not looking to hijack this thing to argue about it. My post there may have come off a little brash.