You’ve ever sacrificed something you love to afford paying for costs associated with your books!
(I don’t typically spend money on myself. I don’t have a shoe habit or get my nails done ever. I’m fairly low maintenance, except when it comes to two things – my hair and my skin. So, when I had to wait two extra months to get my hair done in order to save money for book design and editing services, it was a major sacrifice – but well worth it!)