I do a little of both; I'll spend a little if I think someone is taking an unreasonable hit (I didn't think much about it, honestly, until it happened to me).

But these days I'm trying to spend more upmodding really good, pertinent submissions rather than comments. I want to see HN quickly return to being the resource I came to use so much for hacking, well, news. I'm finding the return on (time) invested here has fallen recently, and I want it back!