2/4 live unbeatable?

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Ive read many posts on how the 2/4 casino game is unbeatable. I just dont see it. At foxwoods (my local room) the max rake is $4 if you get to the river. Tips arent an obligation but i give up a dollar on the big ones.. Ive had no problem building a good stack with all those things against me just playing straight up limit.. nothing fancy. Obviously I havent conducted a large sample so i guess the real question is why do people keep saying 2/4 is unbeatable.

I know it seems high but as a side note im averaging 4 to 5 bb an hour and these games are shockingly loose.