You should be careful about headlines.
It's pretty easy to write a headline that will get someone to forgive your spam, and perhaps even to open your note (CyberMonday! 85% off…). It's pretty easy to write a headline that will get someone to click through on their RSS reader. It's even easy to write a tweet that will get a click through.
But is it better to get a click and then annoy someone, or better to only reach the people who care?
The mindset of the brazen copywriter is, "Well, even if only 1% of the people I trick are actually interested in the content, that's worthwhile. After all, there are a lot of people out there, and offending 99 to get one subscriber or one sale is good math."
The word I use for people like this is 'spammer'.
The mindset of the modern marketer is, "I can build a reputation in everything I do. If I teach people to trust me, then over time, I'll conserve their attention and build permission. That's priceless, particularly in a world that's getting more skeptical by the minute."
Of course, the best thing of all is to have content that deserves a great headline. If you can't do that, though, I think you should forgo the headline.