I have vision problems and have limited ability to read much per day so I'm uncertain of all the terms in this game. At the risk of being wrong, I think you are talking about stars as stamina where I think of them as levels. Regardless 6K per day over the many years these games are played would be 10's of millions of stats.
True, but the cap is 80K. As I think it was you who stated in an earlier post that a target of 100M Game Bonus would be a minimum target to unlock all girls, that would prove close to impossible without a decent proportion of 'Warp Bonus as a multiplier for reset bonus.That should go without saying. The problem is, it costs diamonds and warp is capped.
I agree with all of this but, my point is that, balance is required. Any part of this cannot be ignored. Energy requirements increase as one advances but it wont do the job alone when one hits the girls wanting Quadrillions of dollars for each 10% of their levels. That's where things like Total Game Bonus is your best friend.If you do not have many diamonds, you should not spend them on non permanent thingies.
Energy, studios and warp are permanent. A x8 warp can cost you over 200 later on. That is more than all studios combined or two energy upgrades.
The assumption is this: one is already on their personal warp capping due to diamond costs or at the real warp capping.
The discussion could be: How much energy/studios can be bought when not already at the warp capping. Without hampering progress too much. That is a difficult question. At least the cheapest studio should be okay in any case.
A case scenario: you have 200 diamonds and could buy either a x8 warp or all studios. The x8 does not bring you to the capping, there would be yet another x8 to buy after that. No matter your reset bonus, you will not complete the latest girls. So what do you do? Buying the warp and getting maybe 1-2 more girls, still missing 5 or so. Or buy all studios and level up stamina of the girls you have much, much quicker?