No Problem

When I thank somebody who has done me a service that they are being paid to perform, I don't think that takes the place of a tip. But I also don't like it when that person says, "No problem" in response. The situation could arise where "No Problem" could be appropriate. For example, if I dropped the tall stack of newspapers I carry back to the gift shop and someone passing by helps me pick them up. I would say, "Thank you!" and they could legitimately say, "No problem," if they have some deep-seated objection to good manners represented by, "You're welcome." But they showed the good manners of helping me, so they obviously have no problem (ha) with good manners. So, why? I have no idea.