Delta once again showing that informed customers are not always the customers they want.
Of course, as noted throughout the thread, all one needs to do to view the actual seat map is so a dummy booking for the same flights so I can't really see what DL against by this at all. The only case where this doesn't work is if your flight is sold out and thus won't show up in a dummy booking (even if seats are available for selection but remain empty becuase passengers holding tickets haven't selected seats or can't select those seats).