Novus also gives you the stats you want over what the end game high allagan provides. Such as the case for my whm, I do not like ssp and could use something other than crit, so a novus with pie/determ far suits me better even if the high allagan has 2 spell power more.
And since there isn't a large gil sink for people who craft/obtain most items they want, dropping a few million isn't such a bad thing. In addition the live letters have stated the relics will eventually be the best thing in game like the "Excalibur" for your class. So working toward that eventual goal could prove useful while a majority of the player base is at the same pace/place IE atma and fates. Trying to do fates for atma now takes weeks where as when it first released hoards of ppl crushed fates making it possible to get all 12 in 20hrs or less.