I hear you on the supposed benefits of the "Long Tail" traffic.
However, one thought is that if you can find something very pertinent to your product that you can rank #1 for, even if it's only a little traffic every month, there might be a good payoff.
As I mentioned before I did that with an article recently. Google showed it had almost no traffic (something like "under 10 per day" (indicating almost not measurable). But we are #1 for that and it's highly targeted (one of our programs is based on that keyword, so it's a good tie in).
And the beauty is that the Tipping Effect (winner takes all) is very much to your benefit. It's very hard to dislodge the #1 page if it's been there for a while. (I know, I tried this on one keyword. It took me a year of concerted effort to do this ONCE (and that was just moving from #3 to #1).