A tipping survey by CouponCabin.com shows 32% of adults don't leave a tip if they feel they've received less than average service.
13% said they leave 10% or less for average service.
Most people who tip at restaurants said they leave more than the standard 15% for good service.
7% said they tip 21% or higher for good restaurant service.
The survey shows people feel obligated to tip restaurant wait staff, hairstylists, bartenders, taxi or limo drivers, valet, bellhops, manicurists, spa treatment providers, restaurant attendants,and home delivery services.