I posted this on another forum.

I was reading some interesting threads on the BF forum and one opinion of this charge increase is that they want to drive away traders and those that generate little commission without actually banning them by forcing them to leave on there own.

After doing this they will then start to be involved in all the markets themselves to create the liquidity needed to keep them going, you may say that this sound stupid but they stand to gain far more than they will lose, the traders that stay will pay a huge price for using the service and the ones that go they will lose little as they were not paying a lot in commission in the first place compared to what they made.