Trading is gambling.
When you gamble you must accept the fact that you can, and more than likely will, lose!
Definitions and terms are meaningless - actions and resulting outcomes are what matters most.
If you want an answer as to when you should "risk" more money than you would normally do so, it should be very "obvious" that the answer is when your chances of losing are far less than normal.
How you determine this, will be in direct proportion to how you think, and how you view, the market you are trading.
Sh*ite, if I am not careful I will start thinking that I might know something, and that is a very dangerous thing to do
I used to read a lot of the rubbish published about "trading", but now I prefer to see what transpires in the "real" world of gambling, and paying a little visit to the casino, every now and again - not too often mind you

- can help one get their head out of their arse and see what the "reality" of gambling entails:eek:
Not sure if this helps, but that is what has come out of my head, like it or lump it - but again, the reality is that it really does not matter for me, as I am what I am, and, you should be what you are, not to try and be someone else - not suggesting you are of course