I'm not sure what the term for this is; maybe "quorum problem"?

If too few people sustain a boycott, then they suffer without accomplishing their goal, so a net negative.

If enough people sustain a boycott, they'll suffer but will also accomplish their goal, so a net positive.

For most people, no. I might work through it today and tomorrow but in a few days I'm going to give up and go back to Amazon.