Is there any data on how well these E fares are selling? I've been a big believer that 75% of the traveling population really could care less about service/amenities/perks and just wants the cheapest fare possible (yes, they'll complain about being stuck with 31" pitch in the middle seat or having to gate check their overstuffed carry-on but will still buy the lowest fare possible).

It's not worth it to me to save $10 on a DTW->FLL flight or $20 on an ATL->JNB but can certainly appreciate a family of four being interested in saving $80 roundtrip for their once in a lifetime trip to Disney or the annual trip to see Grandma.