RC,
Sure, you can make the part in 20 min, but, figure your programing time, fixtures, and tooling, and the part quanity.
Usually you need a cad dwg, with all the dim, which you'll probably have to furnish, just to write the program.
One piece can be expensive, but quanity is where the moneys made. If I get a small quanity job, I tell the customer
I have to charge a setup fee. If it's a worthwhile quanity, I'll forget the setup fee. Quanity is the name of the game for profits.
A $10.00 part could cost a $100.00 or more to make 1 part. If your not going to make anything, it don't pay to do it. Remember,
Nice guys finish last. I hate myself, when I lose money on a job. Some customers will complain no matter how cheap you make it for.
just my 2 cents.
Ed