I probably take 5-10 calls per year after 5pm, not worked a weekend in over 7 years and spend them with the family mainly. You can keep your self employment...
Your kids will remember the time spent with them, not the amount of cash.
If you explain properly the reason for the difference in cost most will be respondent, maybe not buy from you but at least they'll understand the difference. Also needs to be done without malice or name calling as you end up just sounding bitter.