I'm sorry but The Filter Coffee is an extremely average place to have south indian food. Massively overpriced and bland flavours. Rameshwaram is still okay, but Filter Coffee is just fancy interiors with no substance.
Things to spend on without thinking twice -
Good healthy food
Good chair to sit & mattress to sleep on
Gym/yoga/swimming classes
Good places where you get peace
These are not spendings, this is investing on oneself!