Novel place for a survey @ Lean Startup Hacks

I recently saw an interesting post by team@gotstarfish.com, on a particular place to conduct survey:


I would share with you an approach
not yet mentioned by others. To the best of my knowledge, nobody else does
this, but I'm happy to share the tactic. I recommend standing at the
entrance to a subway platform and intercepting people just after they see
the train pulling away from the platform. They know they missed the train
and are unexpectedly idle for about 10 minutes while they wait for the next
train. Perfect time to ask them if they're willing to answer a few questions
while they wait.

*Benefits:*
- I get about a 95% acceptance rate on my request for an interview. This is
good for ensuring randomization of the sample (no self-selection bias toward
more open-minded / hyper-exploratory people).
- My time is *highly* utilized. Because I'm talking to people until the
train comes, my only downtime is the minute or two when the train is getting
loaded up. Once the doors close, the train starts to roll away and I'm
immediately prospecting the person who just walked onto the platform.

*Downsides: *
- I have to make sure that I can complete my interview in the amount of time
it takes for the next train to arrive. Checking a train schedule to find a
time when the trains are spaced out at about 10 minutes is a good idea.
- At different times of day, and on different sides of the track, you may
get a different demographic. It is a good idea to try to figure out whether
the sample you're getting is really diverse or not. Usually when they're
getting into the subway car I yell out "What's your age?" and "What do you
do for a living?"

Best,
Jared - Founder of Starfish