What do you want to hear exactly? Your subject tells a different story
How to ask friends to pay a little amount of money for a shooting? Did they request you to do a shooting?
My experience is as follows: people really like nice images of their puppies, kids, ... or a portrait. They love the perfect lightning, they love the perfect sharpness, they like the story the picture tells (if it is a good picture, of course). But, as soon as they have to pay 5 $ for a print of that image, they're gone (worst case). Ask them before.
If you're a professional the story is different. Of course. That's your business and they have to pay for your time, experience and equipment.