There should probably be no doubt that the DS film became profitable - particularly once the worldwide DVD/Blu-ray sales/rentals and on demand figures were factored in. A film doesn't always become profitable by box office alone. But that sort of logic didn't fit in with the Forbes writer's agenda, so of course it's not touched upon.
(As for
John Carter, even its lowest budget guesstimates were huge, so there wasn't much Disney could do but admit they had to write it off because the fact that they did wasn't a secret to anyone.)
The Depp/Burton Dark Shadows played in US theaters for at least 161 days/23 weeks!!
The Depp/Burton Dark Shadows is now out on DVD/Blu-ray!!