I don't think the extra production cost, for the Odyssey at least, is likely to be offset by extra box office income. If you read about it, the massive cameras and limited running time of one load of film (less than five minutes) sounds very burdensome. That's not to mention the obscene cost of the film stock, as well as developing dailies and having to edit from film (they actually cut and pasted film together for the Final Cut of the IMAX version).

The trailers also looked much worse than the film which I suspect is related to difficulties with this whole process.