Quote from Cutten:
Floor = genuine fat edge (one of the best ways to go from 10k to $1 mill+ in a few years), a stimulating environment, you are surrounded by experienced profitable traders of all varieties, and a lot of the people are young and fast-living. Downside is you have to stand all day, can't trade multiple markets, can't trade in your underwear or play music, and floor traders aren't exactly the most cultured group of people.
The other major reason to do it is that it may well be gone in 5-10 years time. This could be one of the last chances to sample that unique environment. Although I have traded mostly "upstairs", I spent a year on the floor and it was an extremely interesting and valuable experience.