Really?
Boston, MA outer suburbs. Verizon FIOS, installed 15 years ago, and I'm currently paying $45/mo for 300/300. For another $10/mo I could have 500/500, but that's overkill for me. I know of no fiber offeringnhere that is not symmetric rate. The asymmetry in your case makes me think there's CATV coax infrastructure involved somewhere, since asymmetry is baked into that technology (as into ADSL, which should be outlawed and replaced with fiber).