Deleted User - 7260023
Back. Who won the fight? 
That's exactly what I'm seeing, too.
Arc BPs are easy to come by esp if your arc is at least level 18 to make two out of one, because many people grow theirs. Dyno tower, Seed Vault and other uncommon GBs are way harder to find as growing, so their BP abundance is a lot lower.
That's exactly what I'm seeing, too.