So pay 12 months of 50k rent , 6000 plus gst fee for 18000 miles. Looks good deal to me. Someone I know also know a way to add money to wallet with 1% charge without gst and take that money into your account. Never tried. But rent payment ways works very well easily.
You need to use 30000 Lufthansa miles for one way flight to or from Europe.
Use the book award flight tab on the Lufthansa miles and more mobile app.
Don't book on the Lufthansa website.
That will extract Rs. 19000 value for 30000 miles@63.33 paisa
25663 one way revenue fare = 30000 miles + 6663 taxes
So 30000 miles = Rs.19000@63.33 paisa