Sure, that's another way of looking at it. (I mean, obviously, nobody is going actually believe that a businessman doesn't care about money, but looking at your idea from the point of view of "what problem am I solving" I think, is a great thing to do, and many people respond better to the "change the world" rhetoric than "make lots of money" rhetoric, even though we all know that the speaker is saying the same thing.)

"If I made something like service X, only cheaper, would that solve a real problem that people have?"

which is the same question the OP is asking, really, just a different way of phrasing it.