Still own a few properties in that area. Very upscale, especially Tysons 2.  

As for Dupont...  Yep, it is certainly a part of the BWI / Dupont / Tysons mix.. popular incall locations.
It's great for those who live there and work there, go there on a regular basis.

However,  it sucks for people who live outside of city to get to.  And fact of the matter is, there are many more people living outside in the burbs than in the city.   Too much overhead involved, parking car at the kiss and ride, then each stop in the metro takes about a minute each. And there's always some thug looking bum screaming nonsense in the train which is mostly dirty and old. Run the risk of getting mugged especially when your dressed up and look like you got some cash on you.

Plus it costs money to park the car, buy a metro card, etc just to go to DuPont.  Compare this to driving to Tysons or BWI (both of which are free parking) which only costs the gas which right now is like $3.

Sure it is "chump change" and it ain't nothing, but not for those who are thrifty.  Some of us can afford to hobby a few times a week yet don't wish to add unnecessary expenses that obviously adds up over time.
Some would rather spend it busting it a nut.

I just might try it

DuPont, Crystal City, Old Towne Alexandria are far more universally accessable.

lets not put words in my mouth. never suggested people down in VA / DC to hobby in BWI.

That would simply be absurd to expect a person in Tysons to go to BWI or a DC resident to go to BWI.  It is obviously not what I was saying.  Also, anybody who's been in the hobby knows very well that BWI / TYSONS / DC are the 3 major incall destinations... lets not repeat the obvious  

However, strictly judging by convenience to the greatest possible audience, what may not be too obvious to a visiting provider is that a location situated between the BWI-DC corridor accommodates the "greatest" possible number.

Greater DC metro area which includes the Baltimore area has a population of 8.5 million.  
The washington DC metro area has a population of 5.5 million.  
DC itself has only around 600,000.

Guess which direction is easier to move? Certainly not inward toward DC. There are several major highway arteries connecting the DC-Baltimore area and multiple ways to get to from just about everywhere. For vast majority of people (read 8.5 million), it also costs less outside of DC than to go into downtown & try to scramble for a parking into a crowd of 600,000.

So, while I'm clearly not advocating people from DC to hobby in BWI,  Jane-provider would accommodate the greatest possible audience by choosing the most neutral and central location to the BWI-DC corridor.  

Of course,  she should switch around a bit by going to DC and Tysons as well as downtown balitmore too in order to avoid using the same hotel too many times.

Never said that BWI should be the top choice for all. I prefer Tysons myself when it comes to better hotels and easier drive, even though I don't live there any more.

However, the fact is that it costs more money for outsiders to get into DC than for DCers to get to BWI or Tysons.

BWI or Tysons doesn't cost anything to park your car.  

Go to Dupont just a dozen times or so, the cost add up to the rate of seeing a provider for 1hr.

Plus read the rant above posted by someone regarding the not-so-wonderful experience he has taking the metro.  

Yes, Dupont is also only convenient IF YOU ARE NEAR THERE but unlike other areas Dupont costs more money to get to, mostly requires metro ride with the thugs if not have to shell out $20 or so in parking, and it's too hot / cold / rainy walking around trying to find a hotel during specific weather conditions and climate.