Could not disagree more. The amount of pots you use doesn't dictate what act you bot lol.
If you can handle Act 3 by burning extra pots faster than your bot gets them, then by all means burn those pots. Why would you want to go back to Act 1 or 2 just to save some potion money lol? There is no way you are spending enough on pots to even make a negative impact on profit, but spending that money on pots could impact profit upwards.
It appears as though there are enough people manually buying pots to warrant a buy pots plugin.