I picked up a job last night. gave her a price, then discovered she had a window cleaner that already charged more than i had quoted, but the reason she wanted someone else was that he was putting his price up by £5.
If as you say the jobs you have are underpriced (we all have those jobs
) maybe, tell cust's the price needs to go up by £5, but do it over a few months. £2 now, then £3 in six or eight months