To clarify, I'm not saying don't do door knocking just because it's "dangerous/desperate." I'm speaking more from the aspect of thinking about what your time & effort is worth.
Of course you can drive around, door knocking 15 houses/day, but there are several factors you'll want to consider.
1) Yes, nothing beats face to face discussion; but if that fact to face encounter is not welcomed, it's not a great encounter. It's similar to cold-calling. Does it work? Yes. Is it the most efficient, and effective way to get customers? No. When I was in finance, my first few years were spent cold-calling for clients to invest with me. Remember "Boiler Room" the movie? I was that guy, except all the cursing, etc. Making 100s of calls everyday. It wasn't the most effective, nor fun. Then I learned how to get referrals, where people were calling me. There are basically 2 ways to set up your marketing in business. Out-bound and In-bound. In-bound is much easier, more profitable, and less time consuming. And I've done door knocking (both when I was in finance and when I got started in real estate), so it's not like I've never done it, and advising people not to do it when I have no idea what I'm talking about.
You can listen to Sean Terry's story on his podcast "Flip to Freedom" on iTunes on how he got started in the wholesaling business; door knocking on pre-foreclosure list, and if he still does it. (short answer: no) Yes he did get started with it, but he gets in to several reasons why you should consider otherwise, especially now with all this technology and resources, you can really leverage your time/money/energy and get the most out from what you've put in.
2) Georgia is a non-judicial state, meaning the foreclosure process is much shorter than judicial states. By now, a lot of the pre-foreclosures/foreclosures have been "cleaned" up so the amount of properties that are still in that phase is much less than it used to be, say between 2009-2012. Plus, homes are more spread out, than areas like NYC, which means if you're going to 15 homes/day, you're spending anywhere between 1.5-2 hours/day driving around, talking to people, who some times say they're not the owners, when if fact they are and they just lie to you. So even if you talked to their neighbor about the owner of a certain property, and they tell you "yeah, he's the actual owner," what's the guy who lied to you going to say when you see him again? "Oh, I lied to you (cuz that's what some people facing foreclosure do), but let me talk to you now?"
3) So if you break this down; 2 hours/day 3 times/week = 6 hours/week, 24 hours/mth, not to mention the extra gas, etc. Even if you found a job that pays $12/hr, 24x$12 = $288, plus say $40 for extra gas you had to spend, that's $328. That's not $328 dollars. That's the cost of your time you are spending, driving around, trying to talk to people, who more than likely don't want to talk to you. (cold, out-bound prospecting).
So if you factor in the cost of your time ($328), plus, say you had a part-time job, working 20 hours/week at $12/hr; that's $960. So $328+$960=$1288. You can more than pay for bandit signs where people are calling you (again, check your local town/city laws regarding bandit signs), or if you can't put up bandit signs, you can take about $1000 and send out 2000 post cards. If your response rate is 1%, that's 20 calls, talking to people who want to talk to you.
Out of the 20, say 15 people call you just because they're curious. But you find 5 that are motivated, and get 1 or 2 under contract.
4) Regarding response rate, it should be at a minimum 2-3%. If your response rate is not around 2-3%, that can mean your message is not optimized. I've done campaigns where I sent out 1800 letters, and got maybe 4 calls. But after reading what I wrote and getting feedback from my partners, my response rate jumped to about 4%.
I've also done post card campaigns where my response rate was less than 1%. Then I changed a few things on the post card and it jumped to 2.5%.
So bottom line is, everything works. The question is which method you think will give you the best return for your time/money/energy and help you reach your goals faster.
Johnny