Quote from schizo:
I, being the other client, believe that IB raises a fair and legitimate concern. If you and countless others mess around to a point where it is slowing me down, I think IB should flog your ass until you're blue in the face. Why don't you run a rigorous backtest first before going live? Obviously, if you have to change your orders so frequently, either you don't know what you're doing or your system ain't robust.
Agreed
work, is an official MM in some European large-cap futures contract (which of course are illiquid by US standards, but their median bid/ask spread would be too tight for scalping and they are the most traded instrument locally). And he always quotes well away from the market, catching large liquidity-taking orders that cut deeply into the futures order book, before the other legs (basket of underlying stocks) have the time to react. As a result of his 'tick-by-tick' modifications reacting to price changes of multiple stocks (the more legs the more variable your implied price and your limit order), he is doing 20-30k modifications per day with only a few hundred fills (easily reaching messaging ratios in excess of 100:1). So this messaging ban introduced by IB at the 10:1 level (which would make his classic futures market-making strategy impossible), has a distinct smell of a conflict of interest caused by the common ownership of the broker and the market maker firms (at the strategy/zero sum level and not merely due to some 'unavoidable' competition for scarce resources such as exchange bandwidth - this is merely the official pretext given for the benefit of the regulator).