That was what i thought first too, but it's totally wrong - and this is easily seen if you look at the (hypothetical) skill chip tt values.
500 lvls concentration gives a chip of (approximately) 1.23 ped tt value, while 2000 lvls sweat gathering would give an (if it could be chipped) 11.75 ped tt value skill implant.
So concentration is slightly more than 1/10th of sweat gathering.
This is all assuming that Mega didn't do other things to raise concentration (be it MF or pet-related). Can you, Mega, enlighten us?
It's an impressing archievement Mega! I wont beat that anytime soon.