Earlier quoted context omitted.
Why is that a problem? Handful of guys doing what they like. Earning enough to pay for a modest lifestyle and I bet they get to put something away for old age. Why does earning a living have to be an unpleasant and stressful experience? By writing and talking about how awesome cool their careers are, they get to boost their sales. Hell, I think I might start writing about how awesome my life is.
There's absolutely nothing wrong with it at all. There are millions of small businesses doing exactly that. There always have been. Most of them just quietly get on with it and make profit. For me, 37signals don't say anything new or very interesting. They just say it really loudly, and try to make out that they're doing something radically different - when in fact they're not.
37signals is not doing anything new. Tons of small-businesses have been operating on the same principles for eons. However, there is so much hype and misinformation in the e-business arena that this sort of otherwise brain-dead obvious business advice is in the minority, and stands out all the more. There isn't one single way for businesses to find success, online or off, but if web entrepreneurs followed 37signals advice more often than they do today they would probably be better off. For that reason I think they're loudness if fully justified.