Let's look at what the extra $300-400 million would have meant if TLJ met expectations. The revenue side is easy:
$620 million domestic x 65% split = $403 million
$40 million China x 25% split = $10 million
$680 million foreign, ex-China x 40% = $272 million
total Disney split = $685 million
If we leave China at $40 million and have the RoW with the same percentages on $1.7 billion we get this:
$792 million domestic x 65% split = $515 million
$40 million China x 25% split = $10 million
$868 million foreign, ex-China x 40% = $347 million
total Disney split = $872 million
Now for $1.6 billion global cume:
$746 million domestic x 65% split = $485 million
$40 million China x 25% split = $10 million
$814 million foreign, ex-China x 40% = $326 million
total Disney split = $821 million
Just for fun, compare to TFA:$937 million domestic x 64% (yes it was lower) split = $600 million
$124 million China x 25% split = $31 million
$1,008 million foreign, ex-China x 40% = $403 million
total Disney split = $1,034 million
To be conseravative on costs makes the lower box office look relative more profitable. If we use a low-ball figure of $400 million for production and marketing for TLJ the gross profit to Disney is $285 million using the first set of assumptions. $1.7 billion would have produced a $485 million GP and $1.6 billion would yield $421 million GP. Those numbers are 70% and 48% higher than what seems to actually be occurring.
For the sake of argument, I'm going to assume that production and marketing costs for TFA and TLJ are roughly comparable. TFA would have a GP of $634 million or 119% greater than TLJ. But as the costs escalate the differential grows larger.
If we use $500 million total for production and marketing then TLJ's gross profit will be around $185 million. It would have been $385 million with a $1.7 billion global cume and $321 million on $1.6 billion. Those numbers are 108% and 74% higher than TLJ will actually do using the same set of assumptions. TFA's $534 million GP using those numbers is nearly 3x times TLJ's.
So yes, 35% doesn't sound like that much. But the extra dollars are pure profit. With a high fixed cost project, the profit margin can easily double if it generates 25% more revenue and that's exactly what happened here. That doesn't even begin to consider the $150 million (and growing) annual cost of financing the original deal.
Yes there will be ancillaries. But those will also be much lower than TFA and probably RO as well. Remember toys and merchandise got cut in half. Audience reception measured by RT and IMDB is also colder than TFA and RO. So maybe DVD sales will equal RO at $77 million but they will be only a fraction of TFA's $183 million.
Looking at the total picture, Disney will probably make decent money on TLJ even including financing costs. But I don't think there is any way to look at that same picture and not see real problems with audience reception which is reflected in the short legs and merchandise sales. Maybe the DVD sales will prove me wrong but there is plenty of evidence that TLJ caused issues with the fan base.