They don’t do it that way for a very good reason and that is to keep in controversial characters and remove dull ones instead.
If it is a vote to win the dullest ones will get almost no votes and will be kicked out. Controversial figures will have people either like or dislike them, few will be indifferent.
If it was a vote to nominate who to evict first then the likes of Nella would definitely be gone.
A vote to win means she is far less likely to come bottom of the vote.