Firstly, Peter, excellent response above. Really made me take a step back and rethink.
Until now..
They charge a 30 BTC fee?
Their largest stock by a mile is their own stock. This just makes them a huge Ponzi scheme no?
All this talk of failing stocks on havelock, when was the last time mpex listed a successful stock?
You don't have to pay the fee unless you have a specific reason to (institutional investor, etc.)
Just use a brokerage like CoinBr (which is cheap as chips), here's my referral link:
https://coinbr.com/ref?c=M1rswGFFjv