After doing the math and considering what our dynamic duo was making with Tuco, 3 million for 12 weeks of cooking at 200lbs/week(Gus' deal) doesnt even compare.

Maybe it's some kind of quantity discount. And by the way Tuco was a drug addicted moron, maybe he would pay more than the guys of the cartel.

i think its also because with Tuco, they had to get their own materials plus risk of cooking out in the open, not to mention it took them like 4 days to cook 40 lbs. with gus they can cook in bulk in a safe location not having to deal with moving the meth.