Moore gives a case-study of how Quicken got started (in crossing the chasm, in ch 6 define the battle - p.139, rev. ed.). Sounds very relevant and useful, and I commend it to you, even though it's about a later stage (providing the whole product ie. to actually salve the pain; and positioning with respect to other ways/attempts to fix it).
Of the people who have the problem that WePay solves, there is a continuum of how bad the problem is, how important it is to them to fix it and so on. But there is also a continuum of those people's attitudes towards change. Psychologically, some people like change and some don't. It is these early adopter that you want - that are a subset of the people with the problem who are suffering acutely.
No, actually. The "chasm" comes much later, when you have lots of early adopters and it's time to go mainstream. That's a very different problem from the one in the OP, which is about how the population of early adopters is not the same for every product.
Crossing the Chasm is well worth reading. It's also cool that the research was originally done about seed potatoes.
This is somewhat tangential, but I would bet the set of all people who stood in line for an iPhone and who refuse to use facebook is vanishingly small.
now compare to people with iphones in 2009 (different to people who queued, admittedly, got stats on this? but still earlyish adopters since 2009 data)
Of the people who have the problem that WePay solves, there is a continuum of how bad the problem is, how important it is to them to fix it and so on. But there is also a continuum of those people's attitudes towards change. Psychologically, some people like change and some don't. It is these early adopter that you want - that are a subset of the people with the problem who are suffering acutely.