Some people do splurge for flowers and a casket, but the last 4 or 5 funerals i have been to stated "in lieu of flowers" donate to such and such. Some people dont do that and still buy flowers.

As for the casket, I believe the cheapest pine box is good enough for me (or cremation). Of course the metal vault around the casket is defiantly needed...you know in case of a zombie outbreak ;)