Yea I've been seeing the same thing on a TPA-ATL-SAT return I have (I've already upgraded on the outbound which is via MSP with an RUC). $1560 FCM offer for TPA-ATL-SAT. I could go buy two new FC , round-trip tickets for $750 a piece. I'd happily buy-up on TPA-ATL-SAT for $150 (ie, move the decimal to the left one place) for the SDC flexibility but for $1500? It really makes me wonder if DL misplaced the decimal or if they have some other logic going on (either seeing if they can really get someone to buy-up for that or are purposely discouraging the buy-up to preserve F seats for other routes/tickets).