Quote from jem:
4. What I do not like is co located servers.... when I was younger I joined exchanges... now I choose not play. I would prefer an even playing field so I could play again and more of the public might too.
All your points 1-3 are valid.
However, how much you or me really loose due to micro - millisecond market player.
Realistically the fastest we can trade is in second time frame without going into more costly infrastructure/overhead. And within that second time frame market price shift should not matter that much because your strategy would have to be based on much longer time frame.
I would say it is not a factor and HFT guy may actually operate at a loss which is your gain - probably about 50% of time.
Markets were never fair and now are a little bit more transparent with new technology.
As to the principle and technology:
Flashing bids/offers on some internal loop and then disseminating them when they are history is kind of playing without risk. They hit only profitable price differences that are visible to them which amounts to being market maker who by definition front runs order flow by matching customer orders.
These guys exploit microstructure of the markets and various speeds at which internal networks operate compared to external loops and play inter-market arbitrage without much risk.
One alternative is to go back to phones and specialists so fund manager can call specialist and fix prices of their holdings.
Another is to simplify rules so they are enforceable and institute central queuing system or tokenization and any quote in the system is controlled by that queue not by local exchange after it is launched. It can be cancelled or modified but at lower priority than executing order. Payments and crossing orders from different exchanges would follow certain predetermined protocol. That way everybody has skin in the game and if somebody wants to slow the system with quotes will automatically slow themselves as well. I guess such system could be gamed as well.
So what is your idea of even playing field and who would provide continuous liquidity and quotation to the markets knowing that they are taking excessive execution risk?