Originally Posted by Wutan

About the 100 Gold Button:

it's random. Got 3* 3 times in a row. Not worth in my opinion^^

If the 100 Gold draw was repeatable, it would actually be more efficient by far than buying FGs and doing 10+1s.
10,000 N-Gold = 142 FGs (just shy of 3 10+1s, but let's call it 3 anyways) = 33 summons for 10k
33 x 100 = 3300

You could do 3x as many summons that way, hence why it is not spammable.