Look at it this way....
I call disney and book a vacation for $3000. DU makes nothing. Disney keeps the $300 they would have paid for an agent booking the same vacation.
Instead I call DU and get the exact same package (discounts and all) and because DU, a
travel agent gave them the business they get a commission. 10% or $300.
DU now gives me the $300. And they make $50(membership)+$15(fee) from me.
Bottom line, by booking through DU heres what happens...
I save $235
DU makes $65 (would have made $0)
Disney "loses" $300
Thats my take, pretty simple really.
I personally will not use it simply because I go ultra cheap. AP rate at All Star in the Value season. (269.50 for 5 nights) so I would only make $27 back. But for any vacation well over $650 it seems like a no brainer.
DU makes $50 for every person that joins, if they book a vacation or not so we'll call that profit.
Now they make $15 per reservation that they make (this is the only part where I can see someone worrying about a catch, Is it worth the time and work to book a vacation and handle all the details for $15???)
Also a benefit (to DU) would have to be the huge jump in
Disney vacations booked through them, I don't know how travel agencys work, but I would think Disney would give them free trips or some kind of benefit for the large number of vacations they will be booking very soon.