The fees seems to be around 2.5%.

I am thinking of flying first class to Asia late summer of 2005. If I over pay my taxes by... umm.. $160,000 I would get 160,000 points. And incur a fee of about $4000. But that is still cheaper than buying the first class ticket straight from the online to asia at around $7,500.

what do you guys think? kinda risky huh?