There's a huge market for "homemade" cookies. In fact, people are buying gazillions of "homemade" cookies as we speak.
The bigger, better question is, "Is there a market for YOUR 'homemade' cookies"?
Why would people plunk money on your cookies rather than buy cookies from the store, from a bakery, from a farmers' market, from someone else in your city who's already selling "homemade" cookies to restaurants?
And "because they're better" is not the answer. Some people want inexpensive cookies (albeit not necessarily great cookies). Some people want innovative cookies (new tastes, new textures, etc.) and they'll pay more for them. And some people want more convenient, better packaged, more "custom" cookies. What's "better" for one group of these buyers isn't necessarily better for another group.
Will your cookies be "homemade" in reality? That is, from your home? Do you or will you have all the permits, etc. needed?
Do you have the next Mrs. Fields cookie? The next cookie that EVERY restaurant absolutely must have?
All of these questions fit any baked good idea.
Joe