I've got nothing against development and indeed, I continue to develop websites. However, I think the problem with the recommendations I see is that most domainers underestimate the amount of time, money and energy that goes into developing a successful site. It's actually quite incredibly large. It's also important to recognize that developing a site is actually fairly trivial in the scheme of things; what's difficult about making a website successful is marketing, and marketing is a relentless, demanding, and never ending task.
Domainers don't understand how hard it is to build a successful website. You can't throw together a "Made for Adsense" site expecting tons of traffic and revenue. (Note there are some exceptions to every development cliché). It takes somethingmore. What that something more is unique to each website. But it takes more than what's already been done before.