Receiving a tip for 1 bit has me asking myself this question. At what point does a tip stop being a useful gift or reward and start being a virtually useless instrument of spam? At what price does the average person (and also average bitcoiner) see a tip as an insult and spammy annoyance rather than a kind useful gift?
For example, I think most people would agree that giving out 10 million 1 satoshi tips would be much closer to spam than anything. But plenty of people seem to think a 1 bit tip is acceptable. So what is the minimum for tips to be perceived as a tip/gift and not spam, and why?