Not to mention some of these countries have unemployment levels as high as 30%, so you could rent to someone who has never had a job, may not speak English and can't drive a car. 

I lived almost 4 hours away but I'd drive up on Monday morning with my supplies and work the 4 cities close to that house, and sleep on my air bed, during the week.

You will get higher cash flow in PG county, but with properties more subject to variance in economic conditions and low to no rent growth.

Someone is driving by to their friends house, work or a school and finds the perfect location.

I keep meaning to attend, but would be driving in from Atlanta just for the meeting, and need to be sure I've got days and times right. 

I dont know your budget but you can Drive for Dollars, Direct Mail, SEO, Craigslist, etc.

That is more than 1 hour driving to his office.

I definitely plan on driving for dollars and attending the local meetings and networking more when I move back this summer.

Also those suburban metro stations are surrounded by lots of parking so they are mainly for people driving in from somewhere else, not so much for people on foot.On the plus side, they are affordable compared to other parts inside the beltway.

I consider close being a 0 - 3 hour drive from one location to the other.