This strongly depends on a combination of which side you are on plus the level of knowledge you can call your own
.edit:
I think I found a bot on an exchange which is used for driving the price up or down without creating much volume. Fun thing is: you can use the bot yourself to make it close gaps in the order book (keep the transaction fee plus the ~1% profitability many bots reserve for trading in mind). When the gaps are somewhat closed, further trading is triggered (not sure yet if that's also bots).
Funny how they test lower/higher orders (if they differ something about 100sat from the previous highest/lowest order) with micro trades to see if the order disappears. If it doesn't, they'll go higher/lower. A bit smarter than a year ago.
What's really dumb (even if it's supposedly only one bot overbidding you): once it placed its order, you can safely remove your order. It won't even check the gap to the next highest/lowest orders, so it could place a more profitable order.
The guys who programmed those bots should really be dickslapped (thanks, YourMother, for this vocab) all day long. Or, on the other hand, they should be rewarded for being clever and releasing really, really bad trading software to the public, so they can benefit from it themselves. ^^