The "Don't make the same mistake twice" message (from Gus) pertains to Jesse IMO. Jesse is a ****-up, always has been, always will be.
He is so stupid that he stole meth from a job where he is making 500K a month.
It could also mean that he is worried about how Walt is spending his money. It is way too obvious. Gus has a nice home, but it is within reason. Gus could buy a 30 million dollar castle, but he chooses to be cautious.
When Gus invited him over, initially I thought he might be gay for Walt
.
at Badger when Jesse asked him how much he sold, and he responded by telling him he sold a teenth Skinny.