Manyu needs tend to dry up much more quickly than equipment seeds though. It takes a lot of equipment pulls to get enough +10 equipment for all your girls, not to mention the ungodly amounts of fodder needed to level them to max. In contrast, it looks like a few people on my friends list are closing in on max level teams (based on their total power) and I'm getting very close myself with only 1 non-max level girl, but I'm not even close to having a full set of maxed equips for my girls.
This crushed my soul a bit:
On the other hand, ampies are something everyone could probably always use more of, so I can see that point.