rejecting low quality ones should be the norm regardless of whether an AI or a human wrote them. the question is what would happen if you were swamped with high quality PRs? what will happen once you are? (that's probably a 2027 question!)
if i did have to think about tokens I use something like together.ai with an open weight model like glm 5.3 (which ill sometimes use to review a claude change for something intricate). glm 5.x is just very chatty though