Because the government continues to restrict Sudafed supply, while Crystal meth improves in purity while reduces in price over recently!
Abstract: “A novel and straightforward synthesis of pseudoephidrine from
readily available N-methylamphetamine is presented. This
practical synthesis is expected to be a disruptive technology
replacing the need to find an open pharmacy.” :)
TIL that one can turn street meth into cold tablets -- if one is so inclined.