Hello @biversen 
While your opinion on the use of boosters in the Builders’ Challenge is entirely valid, this does not make the rankings and calculations wrong. The ranks are calculated as Ixura kindly clarified, which is based on the rules established for this event.
However, we are actively asking for feedback and aim to let creators be much more involved in planning the next BC. For now you can do this here!
We will be happy to note your constructive feedback on boosters and other elements in that thread so we can create an event which is fun and fair for everyone.