I have made Christmas cards for family and my closest friends the last 3 years. And will do so again this year. That can be around 30 cards. I always keep a sample so I know what not to do the next year, lol.
I have a few friends that always ask me for a card before they go to the store to buy one. One friend will ask for 2-3 at a time, every couple of months. I don't charge them much. They keep telling me I should charge them more, but I can't. LOL I take a picture (if I remember to) or keep a sample of these also.
I keep what I make at my stamp club. I have given or sold a few of those. Not many.