Investing in a 5th factory slot? Id call that a waste, not an investment. What does factory provide actually? A crappy 4-star tank now and then? No tnx, im way past the time i was interested in 4-starz; also the rate of appearence of 4-stars is quite low so even recycling them for the 25 BP is hardly a plan. And i never ever seen a 5-star from factory, ~1k tanks prodiced by now. Just IMHO...