Before you spend $10,000+ on development, get a straight answer from someone who builds apps for a living. Share your concept. I'll tell you what's viable, what to cut, and what it will actually cost.
Questions you can ask
"Is my app idea technically possible on my budget?"
"Should I build for iPhone, Android, or both first?"
"What features should I cut to launch faster and cheaper?"
I will send back as a pdf slideshow or spreadsheet for you to download.