This anomaly isn't only limited to Australian Lunar coins. The current ASE proof set being released will probably benefit flippers much quicker than investors (I am attempting to get a few of these ASE proof sets too, both for flipping and keeping).
Numismatic Panda coins have historically benefited both flippers and long term investors. This is an advantage of getting into a bull market relatively early (this effect is not isolated to the Panda market, but this is obviously one area I'm more familiar with).
E.g. If you got into 2009 Pandas two years ago in 2009, you would have more than tripled your net silver value (good for flipping). For the investor, going into the future another 5years, it is likely that you will increase your gains even more so (but no one can say for sure).
E.g. If you got into 2000 Mirrored Pandas in 2007, you could have increased your net silver value by over 7 times (good for flipping). For the investor, going into the future another 5years, it is likely that you will increase your gains even more so (but no one can say for sure).
In both instances (old numismatic Pandas, and newer bullion Pandas) have benefited flippers and investors.
I recommend reading Badon's commentary if you haven't already:
http://www.livebusinesschat.com/smf/index.php?topic=4814.0
He makes some good observations based on historical performance, as well as some future predictions based on current trends.
Badon writes:
"If you don't have lunars yet, it's time to start shopping. Just make sure you buy the rare, older Chinese lunars, not the Australian ones. Dragons are going to be so hot, it might get tempting to taste the grass on the other side of the fence, but once the dragon mania dies down in 2013, nobody will care as much about the Australian lunars, but the rare Chinese lunars will just keep getting more expensive. That's what you want as an investor."
I read what Badon is saying as essentially, flippers will do well on the Australian Lunars, but investors may not do as well (historical reference given previously).
At the end of the day, no one knows for sure. Do your homework, and hope for the best.