Has anyone tried slydial on vacant properties?

[Johnathan B.]

I have a list of about 3,600 vacant homes within 14 miles of my zip code and phone numbers for a little over half of them. I am considering using slydial broadcast to send a pre-recorded voicemail to these numbers saying "Hey my name is Johnathan I live nearby in (city). I was driving by your house and noticed it might be vacant. I just wanted to get in touch and see if you'd be interested in selling it to me. I'd like to pay all-cash for it. Please call me back" and blast that out to a ton of numbers automatically. I figure it is more efficient to do it this way than driving around to find a fraction of the number of vacant homes in my area and then send a mailer out that will just get thrown away. Does anyone have experience with this?