I assume some of the experienced options trader here trade through IB? Or, maybe, they are with other brokers, I don't know. But for those with IB, how do you feel about maintaining an account with a broker belonging to a group who makes about 18% of the options market? I mean, if you have a really big account, like a big individual trader, or an institution, and assuming you tend to be profitable each year, wouldn't that be a loss to IB? I expect that they are on the other side of your trades on at least some of the trades? If your account gets too big and you are compounding your return every year, would that be a worry to IB at all? Can that result in them maybe making a less favourable market for you? Or, in any other way, discourage your trading with them? I ask because I have never come across a broker who happens to be also a big market maker, and think that there might be a conflict of interest here? Sorry if my concern is naive.