Things you don't know until you actually write a market maker: canceling orders is perfectly normal; you'll do it to 98%+ of your orders.
-
-
This Tweet is unavailable.
-
@jamescgibson Don't I know it! - 3 more replies
-
-
This Tweet is unavailable.
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.