So all you have is an idea in your head and you want people to give you money? Don't expect anything. Put yourself in the angel's shoes. Do you know how many people tell them "Psst! Have I got an idea for you!" on a daily basis? Your chances are very close to nil and you need to produce some value to differentiate yourself.

Either roll up your sleeves and bootstrap the beta or have professional courtesy to sit and honestly write down, in-depth why you think it would be profitable for someone to give you money.