Dumb question #9684390 WHY DO WE PUT FLOWERS ON GRAVES?

Why do we put flowers on graves?  I mean I know that they did in cave days to cover up the smell of the rotting bodies, but that isn't the case anymore. 

The ancient pagans made floral offerings to the dead. The publication How Did It Begin?, by R. Brasch, states: “To send a wreath to a funeral and to lay it on the coffin or the grave is a relic of ancient superstition and idol worship.” What was the purpose of their so doing? The author of the same publication adds: “The floral wreath is a survival of the belief that it was necessary to provide comforts for the departed. The flowers were also regarded as, literally, a floral offering, a sacrifice to the dead. They were meant to keep them happy, lest, being dissatisfied, they might haunt the mourners.” So the pagans, in their mistaken belief that the deceased had an immortal soul, honored these dead with floral offerings.

So why do we still put expensive flowers on graves of dead people who don't even know that you did it??? Your money could be so much better in the hands of deserving people in need. I worked as a cook in the homeless shelter on Maui and know how many people could be fed on the money from just one of these flower arrangements.

I am not judging, I'm just asking.