Bots don't necessarily make the market any less efficient though. Albeit a bit of a pain to easily analyze whats going on with all the random transactions.
True enough but it does tend to create a lot of bloat
Just a bunch of the same order at tiny amounts filling the orderbook and what not
I've played with a micro roll bot in php; basically it makes orders on both sides looking for small profits per trade. It's not good when the market is moving too quickly, but does well when there's a trend with less extreme fluctuations.
I made some bots in the past but got to the point that bots suck to make profit. bots are only useful for doing mass buys and mass sells, thats the only useful thing I think they offer