Frugal and extravagant are kind of loaded words -
I was raised in an environment where 'frugal' was a virtue, and 'cheap' was a vice.
Extravagant was sort of equated with 'wasteful' and/or 'unnecessary'
BUT inadequate/skimpy was also frowned on.
Examples: If making shirred curtains for a bedroom - Mom thought it was better to make them look nice and full with inexpensive muslin - as compared to trying to cover 36 inches of window with 30 inches of more expensive fabric.
Amazing how some childhood ideas/standards stick with me!