I am not sure I fully understand how this would affect hot and top rankings and an items visibility.

I'm guessing this might imply that something other than trust score could affect a zappers/commenters weight.

Could a stacker's number of unique readers factor in? Maybe the number of views on their items. Or even the number of their posts' one day referrals?

I'm thinking about how people use YT views to get a gauge on someone's reliability. Flawed as this may be, it is one of the first things I look for when I discover content over there.

To be clear I'm not anti-zaprank, but conversely, I find it to be fun working within its limits.