Speaking of costs -
MASS + $20 fee to be entered into the standings for series championship jersey
(not sure if that includes the reusable number plate fee, i recall having to pay extra for that at races in previous years).
from their bikereg page: "MASS registered racers are competing for end-of-season champions jerseys and individual and team awards in the XC and Endurance races. In order to be entered into the MASS series competitions participants must register for the series here (Bike reg page listing $20 fee) and be assigned a series plate number. Series Registration is a requirement for the series and we will continue to use permanent series number plates with timing chips in them for most races."
H2H automatically includes anyone who raced during any race in the series in the running for the series championship.