The secret to high-scalability: Make a no complexity site which does near no more than a static page, denormalize your DB because even at 2 queries max per request MySQL dries up because it can't do hash-joins, but damnit if you are going to switch to a real DB and implement caching on top of that blah blah blah.
This was almost, but not quite, entirely different from trash advice.
This was almost, but not quite, entirely different from trash advice.