As for the compounding argument.
Day trading is a profession and you need to take out wages from your winnings. This will limit the compounding ability to a greater or lesser extent. You will also eventually run out of adequate liquidity.
Obviously you can compound it up to a certain extent, but most day traders will day trade a set amount of capital and any excess will buy scrip for the bottom drawer, rather than ramping up their day trading excessively.
The reasons for this are probably psychological as well. Trading 1 contract is different to trading 5 contracts, is different to 20 contracts, 100 contract and so on.
Just my
Great post Wayne.