I don't think a blog for that purpose is a bad idea, but I wonder if it'd be better to take the party to them. We could do a weekly lonely email, sent on the same day every week so they know to look for it, and talk about more than just "come see us at this place for a show with these guys." Nothing super long, but some not-too-shallow thoughts/views/ideas/passions/the like. I'd be willing to do it on an ongoing basis, but it wouldn't be a terrible thing for us to take turns, too.
Something else to consider is doing a lonely newsletter once a month. That is, if we have mailing addresses for our list. It doesn't need to be anything fancy and it could be fairly inexpensive . . . the bulk of the cost would be postage. It's just another way to get in front of the lonely crowd. I mean, how many bands do a hard-copy newsletter? People like getting mail, and we can make them like getting our mail.
I just figure that we ought to make some real good use of our email/mailing list if we have it. And it ought to be done in ways that stand out a little from what anyone else/any other bands would do. Statistically speaking, it takes an average of seven to nine marketing messages to get someone to take action on that message. The more we can bombard the lonely crowd with our message(s), the more likely they are to sit up and take notice . . . at some point . . . as long as we're a shade creative and worthy of their time in how we make contact.
Just some thoughts from the marketing world. Of course, we may be doing some of this and I'm just not aware of it. Any comments, criticisms, amendments, discrepancies or persimmons welcome.
Lonely Trey