Will my existing copy of MoneyWell receive updates through the Mac App Store?

No, the version of MoneyWell that you purchased directly from No Thirst is not tied to the Mac App Store and will not receive updates in that manner. It will, however, continue to receive updates from within MoneyWell as we release them, so you don't have to worry that you'll be out of date. Both MoneyWell on the Mac App Store and MoneyWell purchased from us will be updated at the same time with nether falling behind the other.