So, we all know how we have to go from 300 Evil Points, back down to 0, and up to 300 good points (for example) to get from one shop to the other.

My proposal is an item that'll wipe you down to 0, the median. You have to unlock one of the shops first to be able to buy this item, it'll cost Carrion Beetles.

Getting 600 points to bounce between shops is very unmotivating for me and has made me lose interest quite frankly.

The item would be like some kind of water (because, you know, drought theme) like the Cleansing Ichor does to revert your Karma back to 0.

In addition, as servalspots suggested in the comments, perhaps the ability to go over 300 good/bad points.
This assures the shop will not close with one misclick or opposite action.