This man speaks the truth.
The usual gachas on DMM only cost about 40 magatamas for a 10 draw with a guranteed 5*. You can even use free magatamas
The cheapest gacha that gurantees a 5* on Nutaku costs 70 magatamas at least, paid magatamas only.
Here's an image of DMM's gacha options. Unlike Nutaku's that has a fucking million different Pay Only gachas, DMM has only 2 simple gachas. 40 magatamas for a 10-draw and guranteed 5*