Wired Cola

So, I get a lot of spam just like everyone else, though Gmail ensures I never see it unless I want to.
Gmail says I got 1288 spam emails in the last 30 days (I'm basing this on how Gmail's spam filter works: it auto-deletes spam after 30 days, and I never touch my spam folder). That number may be off a bit either way: the rare bad message gets through, there's probably a false-positive or two in the spam folder.
But ever since I wrote about my trip to Greece, I have started getting a very odd message, one that, well, you be the judge:

From: mike.power200@[popular mail system redacted].com
Subject: How much does 1 week in greece cost

Hello,
How much does 1 week in greece cost? It has become obvious I need help with this. Any ideas you have would be very much appreciated. Please help. Thank you very much. Gratefully, Frank

OK then. That's innocent enough, eh? Except I've been getting this message about once a week from different identities, identical in content (wondering about the cost of a trip to Greece).
The first time I got one, I responded back in some detail. Now I just delete them. The one reply I sent out generated no response that I saw. Very strange.
Anyone else experiencing this, or have an insight? I assume it's meant as the lead-in to some sort of 419 fraud, as it's too specific to be an attempt at bulk email harvesting. Maybe I just don't meet the profile of a potential mark, or something.