because you are trading with an endless supply of money as long as you have a job, you will always be able to refund your trading account
Sure. And if you think about it this is identical to you closing a trade with a $600 loss considering margin requirement and opening a new trade.
maybe you have a point everybody should keep 10% of their net wrth invested in a small business even if they don't know what the hell they are doing who lnows? one of these years they may get lucky
the thing about being a gambler is no matter how bad it goes you will always come up with another stash