RT -
If I average, say, 25 RT's per day - and the best rate you will give me is, say, $6 - then I can do some basic math to see how much more I will be spending to get better service. With 250 trading days per year and $1.2 more per trade, then I am spending $7,500 in additional commissions per year.
That is not bad. But I have to tell you that after trading futures for many years I am sure that I have never had $7,500 worth of problems from IB in any year - or even alltogether. For the most part, downtime problems usually average out with gains and losses over the long run.
So to answer your question, your rate would have to get closer to $5 to make it worthwhile to consider.
Thanks for the public dialog RT. Very helpful. LJ