Setting the minimum amount to $50 is only possible if you use PayPal. For Moneybookers the minimum is still $100. Seems like they have a problem with their payment system in general. Just got the following message from them:
"Dear 123RF Contributor,
We regret to inform you that due to some unforeseen technical problems with MoneyBookers.com, your payment for the qualifying month of May 2007 will be slightly delayed.
You should receive your payment by June 20th latest.
We apologize for the inconvenience caused by this delay and thank you for your kind understanding and cooperation regarding this matter."