The Kind-Hearted Smart Aleck

It's becoming increasingly more common for people to boycott certain companies, products, or even celebrity names. They don't like the thought of their money going to these people with whom they strongly disagree on a matter they feel is important. While I can understand and often respect such financial protests, the following questions immediately fill my head when I hear about such boycotts: 1) At what point do we draw the line?; 2) Are these boycotts at all effective (and if so, how effective are they?)?; 3) With uber-wealthy individuals and companies owning so much, are boycotts of all their products even possible?; and 4) As far as celebrities go, is it really fair to boycott a person's talent due to a mistake in their personal lives, especially since they're afforded much less privacy than the general public? I don't really have answers to these questions. I just find the matter to be interesting and am curious to hear people's stories on their own boyco...