I think alot has to do with the broker being used and the MM your trade was sent to.I had a buy in for 1,300,000 shares at .0053 yesterday,all day.they just kept going by me and selling for .005.I am with etrade and I called them because i didnt see my buy listed.After 15 minutes they said the buy was in.I then decided what the heck,if their filling .005's,I might as well change the order to .005.others say their orders were filled,I ended up paying .0055 for 1,066,300 shares right at the bell.
I had Scottrade before etrade and they were terrible.There answer was you have no representaion with penny stocks and whatever happens is out of our control.
WSM