I have alot of stacks for sale. So for me the difference between selling for 25 or 40k is huge. That's why i will sell it a couple of weeks after halloween.
Currently they are selling for 25-30k. We will have to see what waiting until after halloween does for them this year. Like 8 days of people farming them with 'Every little bit helps' is bringing an extremely large number of tot bags into the game. If you hope to get a lot of money for them, you may need to wait a while (as several other people will be unloading after halloween)
Currently the quests pump a ton of them into the game. The sell for about 25-30k atm. They will rise eventually after Halloween ends. Although, if a ton of people are hoarding them to sell after Halloween, it may take a while for prices to rise much higher than current prices.
With how many points you get from a ToT bag, the projected value should be around 35-36k for a stack assuming festive/sweet/alcohol prices remain unchanged. That's using 140g for sweet points, 90g per minute alcohol, and 160g for festive points. If these have been changed, my math will likely be wrong. Assuming varying values, the prices of stacks should float between 35-40k.
If, with the huge influx, those drop in minute amounts, the stack price may go down proportionately, unless it remains the same due to novelty.