Repeatable research for end game (vehicles)

I suggest a simple research in end-game that would allow mega-factory to be build. A repeatable project that increase the number of maximum vehicles by 10, but the cost/time of this research would double each time it is repeated. In end-game, vehicles limit is cleary what make mega-factory impossible (beside mines if not set to infinity). Of course this would lead to massive lag but i don't considered it a problem cause i got a master-race gaming PC.

yes please

Increasing cost yes, doubling the cost absolutely Not.

I like the idea of having something to do in endgame. And having a Mega factory!