$250 for a full day of both devs and designers, plus some kind of product manager to work through the idea? Can't say it's not cheap. I have my doubts you'll end up with anything impressive though. Would be nice for someone to give it a try and post the results.
EDIT: To clarify, I have doubts because it is cheap. Generally a team which can build good mobile apps would have no need to try and get work for $250 a day when there are companies who would pay them 5x or 10x that - so the low price creates a feeling that the work must be low quality even if its not. You guys might be underpricing severely here...
EDIT: To clarify, I have doubts because it is cheap. Generally a team which can build good mobile apps would have no need to try and get work for $250 a day when there are companies who would pay them 5x or 10x that - so the low price creates a feeling that the work must be low quality even if its not. You guys might be underpricing severely here...