The more closely coupled your product and market are, the more you paint yourself into a corner. (You can sell a dead-simple product to a physical therapist, bu

The more closely coupled your product and market are, the more you paint yourself into a corner. (You can sell a dead-simple product to a physical therapist, but you can't sell a physical therapy product to anyone else, no matter how simple it is.) Or, if you prefer a pun: "If you're having URL problems I feel bad for your son - I got 99 problems but a niche ain't one."