It also means that the SP can move up or down without reflecting...

It also means that the SP can move up or down without reflecting the true value of the stock.

IE there may be a good report which should take the price up but if the "bots" are active the price can go down, leaving everyone scratching their heads as to why, so don't worry but wait until they have driven the price as far down as they can and then buy

It's not a level playing field because every trade I make I have to pay for it and there is no way I can afford to make say 40 trades a day and only sell (or buy) a couple of hundred shares