I opened savingsmax account, maintained around 50K - 1L. Also paid other cc bills using hdfc bill pay for getting 750 cashback. After three months, i get regalia with 5L approved.
Actually once it had above 1.5L, but due to automatic sweep-in facility, an FD was created with 35K in 2nd month after my account opening. So after that i always keep balance less than 1.2L.