But why would anyone want to deal with mpex in the first place?
Fees
All MPEx fees are already included. Reduced fees since November 1st, 2013!
Creating new account : free
BTC deposits and receiving dividends : free
Account management fee : 0.09 0.019 BTC monthly.
Buying/Selling/Option exercise fee : 0.5% from traded amount in BTC
BTC withdrawals and asset transfers : 0.1 0.02 BTC fee
Account management fee will be levied from all accounts every month on 1st. Newly registered users pay only part of it - for days between registration and the end of the month.
Referral program
You can get your invitation code or referral URL after you deposit at least 1 BTC - check your profile page. Earn following commission from people you invite:
0.2% from their traded/exercised amount in BTC
20%50% (since November 1) from their withdrawal fees
Ah who doesn't love ridiculous fees.. but wait you can even make money by inviting your friends to get ripped off!