How to convince venture capitalists and investors in funding your mobile game today?

Mobile game industry is evolving fast, both developers and publishers are learning new lessons everyday and the buisness is becoming quite unpredicatble .
That said, how to convince venture capitalists or investors in investing 250 000 dollars for a mobile indie game development/marketing when your chances of conquering millions of gamers ( clash of clans or angry birds) and generating huge revenues (30 millions infinity blade) are close to 1%? what arguments and premisses should you throw?