when you have someone that remembers that you gave a DEEP discount on the last cake, they might expect it the next time. If they don't then I want them as a customer.
My advice is specifially for home bakers. I know I'm my own worst critic, just like the rest of the people here are about what they do for paying people. Self doubt just as I pointed out yesterday, is the beginning of "your" downfall. If you think what you made isn't worth the price you agreed on, then you might get into a rut, where you think that about everything. Or at least for the next few items you make.
We constantly learn, no matter how long we've been doing decorating, but we are being compensated for our learning too. What you learn tonight making a cake for a customer, will help you earn more money in the future. Maybe tomorrow.
If you strive for perfection in your cakes or anything you do, then you'll always be disappointed, as you'll never obtain it, OR if you think you have, then you have nothing to strive for. If you get the mentality that you are ok because you "lost " money on this order, you can also get into a rut, and then before long, you'll be paying everything out of your pocket, with nothing coming in.
There's nothing wrong with "supporting your cake habit". But it's even better when other people are helping you pay for it.
Just a little "so called sound" advice.