Obviously, your problem is what you aren't good at, marketing. And one reason for that I will surmise, if I am any example of that, is that you hate marketing? Right? I can tell just by the way you write about it. I am an researcher and engineer who can't seem to sell water to a rich thirsty man.

Although, I'm not a bitcoin guy, I think you probably have a good product/service idea. You might just want to sit on it for a while, and let the need for it rise. More bitcoin thefts will make it so, and that situation may eventually raise its ugly head.

Also, keep a lookout for somebody who is good at marketing, but understands your product. They will be able to do the market research, and find out where your efforts need to be. And, for the most part, there are people who seem to love it, at least more than you (or I) do.

Keep at it, make improvements every once in a while, remember to blog about it, keeping it alive, and maybe rethink your $1/month price, as that may seem too cheap to somebody who wants to protect $1000's of bitcoins. Maybe come up with a tiered product service? Good Luck!