User blog comment:Arkxiah/These summons recently/@comment-24570336-20170608181452

Players here would either:

1. Spend lotsa Gems for Limited Edition units or for a unit they want, or

2. Save up for a specific Summon Gate (ie. Omni Summon Gate)

I go with number 2. Therefore I don't buy any Gem just to summon unit, since a F2P player can even summon a Limited Edition unit if one is lucky and smart enough.