When r5s were t2 rewards, a lot of them were stronger then old r6. And r5sonly need 10% resources of a r6 upgrade. Best upgrades were r6 evo cards in camp events, since we only need to get one card from 80 to 115, as opposed from normal cards.
But now, its so unbalanced its fucked up on so many levels, they might as well give us all a full r7 deck, and we would barely MTM 1, not to say 9 of them.
Even to max a r5, you need medals, about 230-250 per card and 250-260k credits, bringing you to 750k credits to MTM a damned thing. Making few raiders in a event right now is costly to upgrade also. It just spiraled out of control when R6s were introduced.