Well, that changed in a heartbeat. This addendum is so as not to mislead. This morning it was 32x (would have been excellent with today's "Groupon Goods" offer of an Android 2.3 tablet for $129... 4,000+ miles), mid-day it was 1 mi. per $1, then 8x this evening.
The only real take away is that it's a better idea to buy Groupons through an airline shopping mall, and get miles, than not. That's if you can live with what Forrest Gump's mama always said: "...like a box of chocolates, you never know what you're gonna get..."