yes well if you are risk taker business is all about taking calculated risks since you cant really predict who will need your service or buy your produce
Also you may need to differentiate your business from others doing the same thing. If you the only one offering it in your area, you will have loyal customers (you also need to define your territories, less you poach someone elses business) so theres that as well.
You need to do a SWOT analysis and forecast your turnover...though that could be hard for a start up to calculate. For some, it it is something they LOVE doing then its more of a passion than a way to make money. But then they must have a lot of reserves or capital to even do that in the first place, to run at a loss.
if its a bakery what do you plan to do with the bread that doesnt sell? is the flour organic or laced with chemicals?
if its a coffee place are you going to be environmentally friendly or use disposal cups that litter the environment? will you use up your coffee grounds in the garden? Is the coffee sourced fair trade? all that to think about. Will your workers actually be able to afford rental accomodation if they work for you or are they just getting by or living with their parents?