Considering some sites say the film cost $100 million, some say $125 million, others say $150 million, and still others say $175 million, I'd say inconclusive probably doesn't even begin to describe it.
And the thing is that what many of the sites doing the saying would appear to be doing is seemingly simply pulling a figure out of a hat, so there's no way to tell who might actually be closest to being right and who's just so way off that it's not even funny. And as jimbo rightly points out, we're likely to never really know the actual figure because studios are loath to reveal film budgets. And the sites doing much of the saying also know that. So what they're saying is really just based more on their own perceptions of the film and those involved with it than anything else - and certainly more than actual facts.
52 days 23 hours 3 minutes 58 seconds since the Depp/Burton Dark Shadows has been in release(ET)!!