I am starting to think that certain people upvote things to read later if they are blocked by their corporate firewall (like this site for me). As HN gets more

I am starting to think that certain people upvote things to read later if they are blocked by their corporate firewall (like this site for me). As HN gets more popular, I think the trend is for these votes to get more frequent while the old-timers still don't upvote much at all. I have been thinking of this for a while, and this might seem like a good enough of an example. Anyone else have any thoughts?