I haven’t seen this option discussed by our product team, but will be sure to surface it to the team as something we ought to consider!
I’ve heard this from creators before as well wanting certain tiers votes to weigh more than others and think that it would be a great option to offer creators.
If you need help with our API, you can refer to this post here.
I’m making my own solution in Python by downloading the Relationship Manager CSV and combining it with the Poll Votes CSV to calculate the weighted results.