The last time I've seen people doing this on ladder was at the start of AoO when it was clear that dhunters were extremely broken and its cards were widely available to everyone. Play was around 70% of the meta then, I think
Otherwise, I can't see why anyone would do it. In most cases, even now, tier 1 decks probably only make up somewhere around 20 - 30% of meta. So if you, for example, put double Kobold Stickyfingers, Acidic Swamp Ooze, and Frozen Shadoweaver into your deck in anticipation of evolve shaman, what are you going to do about the games when its not evolve shaman? Its sort of like creating a deck that hard counters the current tier 1 deck whilst being hard countered by every other deck around it.
Sure its satisfying to beat the current top dog. Not so much when you're being beaten by the tiniest runt of the litter.
Edit: If anyone is wondering why my post is worded like this, its because its supposed to be a response to OP, who apparently have removed his post
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