I'm a F2P on iOS and I was wondering if it is worth it to save 45,000 gems for the 'Hire Heroes and Win' Big Prize which consists of 5 rare heroes. Sorry I cannot give much more information about this event because I do not remember much about it the one time I saw it.
I roll 900 gems a day for the eggs. Even my F2P account generates enough free gems that I can usually roll 900 several times a week.
Without doing this, I run out of eggs, and I never want to stop incubating. I think that’s more valuable than anything else.