Moos know anything about economy and you have all to remember RBW is a company they will use their able money in the way they think it's the best for them.
Mamamoo was an established group a mediocre mv would do nothing.
A debut with a good mv can make the difference. https://twitter.com/Whee_Leggo/status/1325492945726787586

Also talking about the tour mamamoo were asked in august 2019 if they would like to do a world tour and they said that needed to be talked because it's a big thing. Oneus are rokies they have to do as told, mamamoo can choose so I think that's why they don't go on tour

And also going on tour isn't that amazing a world tour done properly means months ago from your loved ones sleeping in hotels and just working resting travelling repeat. I know all moos want to see them live but sometimes we have to think that they might didn't want to do it.