This is actually a really smart post.
I'm not sure how much money Jake is making, but even if hes making more than a $100 a week its usually the same thing.
Get your money friday, blow it all in 2-3 days max, then be back withdrawing on monday/tuesday and scheming to get more drugs when you know damn well you're gonna be suffering half of every week anyway cause you never have enough money in the first place.
It really paints a more objective picture I think of how the process goes, but the sad fact of reality is that addicts are just as addicted to the swings of feeling sickness/high as they are to the drugs. So I imagine even if Jake doesn't realize it its actually the entire process that keep drawing him in, not just the dope.
In a sadistic kind of way it just makes life "exciting", that is untill your ODin in your car going 75mph on the parkway. Next time he might not be so lucky and just "nod out", next time who knows what will happen.