I think part of the problem is a disconnect between what the customer conceptually thinks is going on (a single buy request, as far as I can tell) and what is going on behind the scenes - a bunch of individual purchases being made by the broker.
If it wasn't possible for people not directly involved in those individual purchases to listen in and react to them quicker than the broker can fulfil the remaining purchases, it wouldn't be a problem. What is going on may well not actually be illegal, but as an individual trader it's not something you'd expect to be able to happen so it's definitely worth knowing about.
If it wasn't possible for people not directly involved in those individual purchases to listen in and react to them quicker than the broker can fulfil the remaining purchases, it wouldn't be a problem. What is going on may well not actually be illegal, but as an individual trader it's not something you'd expect to be able to happen so it's definitely worth knowing about.