The per day fees are outrageous, especially if you can't "move" that daily access as you travel.

If you have (and pay for) a monthly T-Mobile account, you can get wi-fi without additional payment in the public terminal areas immediately adjacent to many Admiral and Crown Rooms throughout the country, as well as off-airport Starbucks in thousands of places. (Off airport, the Starbucks set-up usually works in the parking lot, if you don't want to feel like you should buy a coffee inside.)

To cut the cost of T-Mobile, just pass the account name and password around among your colleagues. We keep one account for my small company. (Only one person can be logged in at once.)

The only on-airport Starbucks with wireless I have seen is in Louisville. I asked at MSP and the answer was no.