Just because a sub-niche is popular doesn’t mean people spend money on it.

Amazon – http://www.amazon.com

Amazon is a great place to see what currently exists for any given sub-niche.

Chances are, the more books there are written on that subject, the more that market spends on those topics.

For example:

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First I specify “Books” to search. Then I enter my niche, in this case “crafts.”

Uh oh. There are WAY too many books returned. This niche is not targeted enough. It is too “mainstream.”

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Much better! There are possibilities here.

We now suspect the following:

1) This sub-niche may be targeted enough.

2) This sub-niche may spend money.