rollover buy for AUD/USD

i've been experimenting with the pair recently and last week i actually made a gross loss from the pair.
but thankfully the rollover is so high that it not only cover the loss but also make me some profit.
is the trend reliable or is it just a glitch?
thanks!

It's a common carry trade position. You'll probably get a lot of profit from it in the medium-term period. But be careful, if something wrong will happen with the global economy, there might be huge downward movement in this pair.

I saw larry kudlow saying the economy is rebounding and that we are going to have a commodities boom. Seems like a logical time to go long AUD/USD right?

Yes, but the unexpected problems are always... unexpected, you know?

any idea what those unexpected problems might be

Anything - from U.S./Germany/China/Australia or a major global bank bankrupting to some massive terrorist attack.