I once had a problem of that nature. Before I became a politician, I was in the medical equipment business. The United States had some problems with gifts: some people were trying to influence doctors to buy their products. The problem became so bad that, even if I wanted to give someone a coffee mug with my name on it, with the sole intent of promoting my company, the doctor was not able to accept it.
It still frightens me. I find it ridiculous that someone could try to influence me with a ten-dollar gift. I will not speak for all my colleagues, but I am almost certain that not one of them would feel influenced by being given a ten-dollar gift, even a fifty-dollar one. No one would think that it would influence a vote, for example.
When we establish a code of ethics like this, the challenge is to be reasonable.