A little Hakaras Hatov on both ends goes a long way. I have a store and it always feels good when a customer compliments about something in the store – it makes me want to go the extra mile even if some of you will say I’m egotistic. Thats how Hashem made me. I work hard to bring you the products you want. you thank me and I’ll thank you!
When I take my kids to stores, museums, etc we always thank the workers. It’s just good middos! What does it waste from you – 3 seconds of your time??