The thing with buying vacant land is that there are not many ways to make a cashflow, and the lot may require routine mowing if it is in the city.

My reasoning is pretty easy to follow- 1) Many of the rest of the world's central banks are lowering rates in fact some are going negative.  2) Inflation is currently a non-factor and is expected to be until 2018 given the continuing rout in commodity prices I don't see that turning around any time soon. 3) Labor participation rates are at long term lows.  

I would imagine that through direct mail campaigns, it may raise eyebrows as I'm not fishing for listings, I actually want to buy myself.

I am a full time Rehabber and a Realtor as well,  and I routinely come across good buy/hold investments which I provide other investors with. 

I provide a complete acquisition and management service, covering the following.Pre-purchase inspections to determine repair/upgrades needed.Coordinating renovations and preventative maintenance.Tenant screening, writing leases, rent collection.Payment processing to vendors for repairs & routine property maintenance such as air conditioning, pest control and lawn care.  

You don't need to set aside time and drive a certain area, you just do it all the time, it should be a part of your daily routine, If your going down a street anyway why not keep your eyes open and drive for dollars at the same time.

3) I don't call it "advertising", but I have cash buyers that I trust and I routinely discuss deals with them (not all but the ones I am close to) to get an idea of what they will pay.  

Develop a follow-up routine.

(I also go down to Palm Beach County because I routinely conduct certain other business in Delray Beach, and Boca Raton).  

However, having another job is going to be one of the biggest factors in this, particularly if the other job is full time.It is honestly very difficult to say with a straight face that you work 40 hours per week in a job and 41 hours in real estate without pretty much anybody raising an eyebrow at it.The other issue is, even if you don't have a full time job elsewhere, being able to honestly say that you spend 14 hours a week in real estate is also tough if you aren't in the middle of a remodel almost continuously.I'm not saying you don't qualify.