I just don't know how you can say Disco's quality is validated by how many people bought it. As I pointed out, a lot of those people bought it not only without having tried it, but without having the slightest idea what it actually did. They evidently bought it just because it made smoke.

I guess you can argue that filling the smoke-making-app gap in the market is a quality, but it seems to me that its success is irrespective of whatever quality it may or may not have. I would say that if you are selling copies of your app sight-unseen, that indicates brilliant marketing, not brilliant software.