Think about it this way; even though some of the long-tail queries have a lower search volume, the people searching these terms are typically looking for something very specific. In turn, they are more likely to click on your blog post, and are probably more qualified. These are the people who are likely to buy your product.
Yes, you'll have less traffic, but the traffic that does land on your blog will be more likely to buy. We'd rather have 50 visitors with half converting into a lead than 200 visitors with only 10% converting into a lead.
Check out this article for some keyword research inspiration: http://blog.hubspot.com/insiders/find-keywords-for-your-business
You can truly find an abundance of keywords for even the most niche industry, it just takes a little bit of work.
We wish you luck in your inbound efforts, it really does pay off!
- New Breed