IMHO, this isn't really what the Lean Startup mantra is all about. Lean-wise, one is really trying to see where there is customer/product fit. When there is, it's like finding a filter's resonance point : Suddenly you've found people's hot buttons.

[ no, no, meh, hmm, YESYESYES, hmm, meh, no, no]

The key to the Lean part is only doing a schlep when you've identified that it'll pay off once done. Don't schlep until you've got evidence that the destination will be worth the trip.