You likely need to own that property to make the money. I'm sure the current owner was appreciative of your efforts.
Dellena is pretty much right mg03f.
Residential lots, such as your home lot, usually don't attract buyers. One can work around this by inviting other Sims over to your place.
Probably the best option is to own a commercial lot such as a Hangout. You will need to have some of the Bakery Items (such as the cash register) to run it as a business.
Additionally, if you find yourself unable to keep up baking, one can use the cheat mode on the Baker's Oven to spawn the recipe with perfect quality.
For those unfamiliar with the cheat mode:
1. Go into Build/Buy Mode.
2. Ctrl+Shift+C and enter 'testingcheatsenabled true' (don't use the quote marks)
3. Press Shift and Click on the Baker's Oven
4. Select any of the recipes that pop up.