I give them to whomever answered my question correctly and thoughtfully. Since I never ask personal question, or questions that have one good answer, I like to mix match & pick one that stood out to me.
I don't know dude. I actually try to evaluate the opinion by how much effort did the opinion holder put into actually trying to help the asked solve the problem at hand. Everyone began this site with nothing and worked up to their experience level. To only award certain levels keep others from achieving a better rank