BobLinderman, I thought the same as DH after reading your first post, but was intrigued nonetheless. I've earned over 350,000 pts with greenpoints.com to date, but that's only after a month's worth of use. I shop ALOT for work related supplies, so the GP site has come in quite handy.
I had an additional 198,000 posted today and almost followed your advise, I mean, it's tempting to get the miles from the flight in addition to the free ticket, but felt it was too much of a premium for an advanced ticket, I opted for the ff points instead. Thanks for your post!