The problem is that there are two different units, elven cavalry (8 GB to
raise, 2 to maintain) and elven knights, (???). The knights have higher
ratings in charge, melee, and number of hits they can take, with a lesser
rating in missile attacks. If the 6 GB to raise, 3 GB to maintain is
accepted, it's easier to raise elven knights. 8 GB to raise makes it just as
easy.