I agree @CavaliereVerde
I think that the equity is important for investors, but It is important because often they are thinking in terms of risk, looking for the Spirit of feeling that the trader is sharing the Risk as has pointed out @yhlasx
Be in the equity or in the investment of their own darwin, the concept really looked for is how much I can invest to Risk the same that the provider. I name this, equity equivalent of the Darwin.
Everybody can understand this and It is really easy to calculate:
EQUITY EQUIVALENT=EQUITY x VAR / 10%
When I analyse darwins the equity is only superficial image, but I watch this equity equivalent. For me it is exactly the same 500 euros with 20% VAR than 10.000 euros with 1% VAR.
In both cases the equity equivalent is 1.000 euros (500*20%/10% or 10000*1%/10%), and I know the level where I am risking more than the trader.
I don't day where It is the minimun level to be investable because is subjective, I only say that there is a level to difference a video Game/demo account VS something investable, and It is the equity equivalent not the equity what decide It.