Average job=650sf x 1penny=$6.50 -or- 2 pennies=$13.00. No big deal, most will not flinch. Now, 1 nickle=$32.50, that will catch some off guard(previous customers and previous charge). So, a penny now and a penny later-soon your up 4-6 cents.
Ron- Ive raised my prices because I want to make more, simply as that. I went from .13(in 93) to .25-.30(in04). I look back on some of my first invoices and man was I giving it away!!!!!!!!!