The line (80M GP) is probably the one that devs found to say that below that value your guild will not gonna do it at all... it's probably like placing a 50M GP guild doing HSR.
Way worst than the 80M GP requirement is the "choose between content" thing. It's just ridiculous. No one should be forced to choose between DIFFERENT content that have different rewards (situation way different from tiers or brackets for instance). That is something that can break the game and it ISN'T a must... they are just choosing the easiest way for the development and exploration point of view... not the best solution for the costumers (players).
