Reducing MP income isn't going to make them "elite" it's going to ruin OKW's early game chances even more. OKW's first units are by no standard "elite", Volk's are the worst baseline starting infantry in the game till they reach vet 3.
And MP would still happen because OKW will still eventually get all their units out, and then stop spending because they have no bloody fuel to spend MP on tanks/vehicles.
If you want OKW to be "elite" with reduced MP income make it so the starting units are "elite" and thus able to handle the immense amount of allied infantry on the field early game.
To bad OKW doesn't have the fuel to make vehicles. So even if you nerf the shit outa OKW infantry they will still be everywere because of the fuel penalty.
Why the hell should they cost more than Allied basic starting infantry when they are worse in every stat until Vet 3?
Because of how well they scale mid- late game plus shreks, and bullshit vet 5 abilities. The same rationale why Cons and Grens cost the same even though Cons dont scale well late game, while Grens are amazing all around. VG should be Cons and Cons should be VG stat wise, the utility of both infantry squads should make them equal in terms of cost.