I think a better question is "What would you pay $10,000 per month for?"
I mean, although I would pay $5 a month for a Lower Manhattan penthouse, a late model Dodge Charger, five pounds of ground beef, etc., there aren't many things that I think are both worth about $5 a month and are worth the overhead of paying someone to do it...well maybe Mad Magazine or something else content based.
But that's not an app or service. And anyway, the last thing I would recommend as an MVP is an app because there is no control over customers or sales channel and no way to iterate quickly.
I think this is a reasonable introduction to pricing: http://www.slideshare.net/omohout/lean-pricing-startups
Good luck.
