Is the rake just an excuse for bad play?

[formula72]

I often hear how HU 3-6 limit is nearly unbeatable due to the rake, and how people say that only after 1000 hands the rake sucks 1 billion dollars from the table and so on.

Now after some basic math...

HU limit 3-6,
average pot size=$15
rake .50
=30 to 1 pot to rake ratio.

Live 15-30
average pot size $180 (approx)
rake $5 + $1 tip
=30 to 1 pot to rake ratio

And since heads up allows you to exploit your opponents weakneses even morer than in a full ring, why is this game getting succh a bad rap from the rake or am I just talking to the wrong people.

Agrees and insults both welcome