siwel100 >> I believe you're shorting VOG - hows that going?
Not toooooo clued up on shorting as it ain't my bag, but technically the most you could EVER make is 100% (isn't it?) and thats if the company goes bust!
So if you short 1000 shares at £1 and they go to £0 then you get £1000 - what are the chances of that happening?
I suspect you make on average of between 15-20% return which I suppose is adequate if you live on the bread line.
But as you yourself have said, BITS has gone up 800% - it doesn't take a complete moron to figure out where you get the better returns