The problem with that is that it's easy to blow through your savings sending out all of these letters, and then give up before your efforts starts to bear any fruit.  

If (and most people don't) you do the math for the risk and factor in the cost you should be worth for taking the risk and the number of total number of house you invest including the time it takes to find a property and then factor in flips you don't make a profit on and those you actually lose on there are many more fruitful things you should be doing with your money.Example?

I was going to post a picture with poop in a basket but thought @Brandon Turner would remove it... 

Its a question to get rid of fantasy land sellers and unmotivated sellers as fast as possible without ruining the fruit for a later call. 

Do people put all the gurus in a basket?

In fact its the low hanging ripe fruit that we are picking.

While your postcards have been fruitful to me, but I've started to worry about whether or not the postcards have been delivered in a timely manner.

IMHO be buy from "Mom and Pop" investors not the guy or gal who has purchased 500 houses during their career so I dont want to waste marketing dollars on the high mostly unreachable fruit.

I just bought and sold one last week that was owner occupied.Think beyond the low-hanging fruit. :)

However, these properties won't be low hanging fruit.