I think the question here is time. No one will argue that with 6+months and 200+ dollars like BakaHentai has invested that you can't get a good rainbow grid. The thing is that with one $50 (in theory) miracle ticket and following sanahtlig's guides, your mono element team can be clearing ults within a month and rags in 2 months. And with considerably less grinding since you only need 1 team leveled. And if your mono team can handle all the non resist element content at max difficulty (5/6 of the events say), that may be enough for many people.