A doubled price of TP isn't going to prevent almost anyone from not having enough. (Yes yes, I know there are edge cases where $5 matters, but weigh that against the alternative.)
On the other hand, a doubled price of TP means that hoarding 10,000 packages becomes far more expensive, and less profitable.
On the other hand, a doubled price of TP means that hoarding 10,000 packages becomes far more expensive, and less profitable.