@ ATPG, I think that you are generaly right about concentrating lynch on abstainers/no voters (the ones who avoid woging)
I believe that it is good because it: does not allow mafia to hide easily (as you mentioned), but also encourages more active play from townies. Which is, again, good for two reasons. First, it generates material for later analyses (and therefore benefits town). Second, it makes game more interesting. I, for one, find it more interesting both as mafia and as a town to do something in a game thread, at the very least voting every day. And I also believe it makes game more interesting for others.