I didn't answer. My question still remains:

I wonder how cheaply this can be done to max out the promo.

I can see it being done for a bit under $60 per night, but I'm curious on how much under that it can be done to lower this even further below $1500.

DFW it isn't. So far the best deal that I've found for maxing out the promo on regular paid stays would be a combo of using a negotiated rate at a Hyatt on another continent and then doing one of the two (depending on if the account is or is not a Diamond account): 1) use the Citi credit card where it covers the fourth night of the stay; or 2) doing 25 one-night stays at the same property.

Perhaps someone can find a property willing to cut a special deal under a unique corporate code to make this promo even cheaper to pull off. A few years ago, there were some Hyatt hotels that were more than willing to negotiate with some individual FTers and do this. Nowadays, probably harder to find such properties.