So, I link to Amazon fairly frequently here, and when I do I use the referral link "ref=nosim?tag=vglnk-c319-20" to kick some money back to MIRI / whoever's paying for LW.
First, is that the right link? Second, what would it take to add that to the "Show help" box so that I don't have to dig it up whenever I want to use it, and others are more likely to use it?
This is done automatically in a somewhat different way. So my advice is not to worry about it. But, yes, it shouldn't hurt and and it should help in the situation that viglink doesn't fire. In those comments, Wei Dai agrees that this is the referral code.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.