Quote from cvds16:
the only way to trade intraday options is sitting on bids and asks and picking out options while getting your right delta using another instrument. In this way your getting your edge. It's basically market making. If you do a decent volume you can make a nice living. I did this for some time on DIA, but then cancellation costs wrecked this.
Sitting on bids and asks in the same series is a privilege reserved for market makers. Spoofing is also against the rules. So, presumably you were doing so on different series?