True enough, I was discussing direct market access. If you're going through a third party, it's up to you to vet them and make sure they are trustworthy. I agree almost word-for-word with Optiver's submission on payment for order flow:

http://www.optiver.com/pdf/FSA%20consultation%20on%20PFOF%20...

I believe brokers in the US are now legally required to reveal any such arrangements to their clients.