If I have to pay for the extra space, I'll also be checking if DJ can offer extra space seating if QF have sold out. Previously, I wouldn't have given any thought to DJ's product. I'll still use the QF lounge though - even if it is before a DJ flight.
On the odd occasion I have to jump on a DJ flight I also will sit in the QP instead (and I have a Gold DJ card).
Paying for Exit Rows, I wonder if that is just for people that want extra leg room... what about people that are literally 6' 6"+ who really "need" the extra room, as opposed to some of us that just "like" the extra leg room.
I alike this to past threads about a "fat tax"...